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Y Combinator argues that Apple’s control over iPhone app distribution, payments and customer access can make some startups harder to launch, grow and fund. That is an advocacy position in the Epic Games v. Apple dispute—not a court finding that Apple caused a measurable decline in startup formation. The practical concern for founders is broader than a commission: dependence on one platform can constrain a company’s margins, product choices and relationship with customers.
What Y Combinator said—and what it did not prove
Y Combinator, the startup accelerator and investor, filed an amicus curiae brief supporting Epic Games’ position in the continuing dispute with Apple. An amicus brief lets a non-party offer a court its perspective on issues in a case. TechCrunch reported YC’s argument that App Store rules had stifled startup innovation and said YC had been hesitant to back app-based businesses exposed to Apple’s commission structure. The Ninth Circuit’s December 2025 opinion also lists YC among the amici. TechCrunch’s report and the Ninth Circuit opinion establish the context; they do not turn YC’s view into an independent economic study.
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The distinction matters. YC has a direct interest in the conditions facing startups, but its filing is advocacy in a legal fight. It should not be treated as proof that Apple’s policies caused a quantified drop in startup creation, investment or growth. Its central point is about incentives: if founders and investors expect a platform owner to influence how an app reaches users, gets paid and communicates with customers, they may judge the business as riskier before it is built.
How App Store rules could affect a startup
Consider a hypothetical subscription app aimed at iPhone users. To reach those customers, its developer may need App Store approval. If the app sells digital access, Apple’s rules may affect how payment is handled and what the app can say about other ways to subscribe. The founder can accept the platform’s terms, redesign the product or pursue web-based billing where permitted. Each option has costs: a fee can reduce margin; a separate web checkout can add steps for customers; and a native app may still depend on Apple for installation, updates and access to platform features.
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- Margins and cash flow: A commission on qualifying digital transactions can leave less revenue for hiring, marketing, infrastructure and support. The burden may be especially significant for a young company with limited volume and cash reserves.
- Pricing and payment experiments: Payment rules can limit a startup’s ability to test billing models or use an existing customer-payment relationship. Running web and in-app billing together can also mean maintaining separate systems and reconciling entitlements.
- Customer acquisition and ownership: App Store distribution can be valuable, but dependence on it gives the platform influence over access to iPhone users. Restrictions on steering may make it harder to direct customers to another purchasing channel. This does not mean a developer is generally barred from communicating with customers.
- Product design and uncertainty: Review requirements and the risk of rejection or changing interpretations can affect launch plans. A startup may delay a feature, add compliance work or avoid a product idea whose viability depends on a disputed rule.
- Fundraising and valuation: Investors may account for the possibility that a third party can change a startup’s distribution or monetization terms. That platform risk can matter even if the company has not yet paid a large total commission.
These channels are not equally important to every app. A business selling physical goods or real-world services is not automatically subject to the same payment analysis as one selling digital subscriptions. Advertising-supported products, enterprise software and free apps can also have different exposure; a free download may still sell digital services later. The relevant question is what the app sells, where the customer buys it and which rules apply—not simply whether it has an iPhone app.
“Apple tax” is shorthand, not a universal rate
The phrase “Apple tax” is commonly used for Apple’s commissions on certain App Store transactions. The U.S. Department of Justice has described Apple’s historical structure as generally involving a 30% commission on App Store downloads and in-app purchases. But it is inaccurate to say Apple takes 30% of every dollar an app business earns. Rates and obligations can vary by transaction, subscription, developer eligibility, program and country; qualifying developers may be eligible for reduced rates, and some categories of purchases are treated differently. The DOJ’s description is useful historical context, not a substitute for checking the current terms that apply to a particular app.
Fees for external purchases, alternative payment arrangements and alternative distribution are separate issues and can vary by jurisdiction. A developer should not assume that moving a transaction to the web automatically removes platform costs or is allowed under the rules for its app and storefront. Apple’s App Review Guidelines and developer terms are updated periodically.
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What the Epic case changed in the United States
The dispute began in 2020 after Epic challenged Apple’s in-app-payment rules and commission structure. In September 2021, a district court injunction addressed Apple’s anti-steering restrictions—rules that limited developers’ ability to include buttons, links or other calls to action pointing users to purchasing methods outside Apple’s in-app payment system. Apple filed a compliance plan in January 2024.
On April 30, 2025, the district court found Apple in violation of the injunction. Its order barred Apple from imposing a commission or fee on purchases made outside an app, restricting or conditioning how developers directed users to outside purchases, or otherwise interfering with a consumer’s choice to purchase inside or outside an app. Apple described the ruling and its appeal in an SEC filing.
On December 11, 2025, the Ninth Circuit affirmed the injunction in substantial part but modified it. Among other things, the appeals court said Apple could require comparable size, form and placement for its payment option and an external link, and could charge a commission on some link-out purchases. It sent the case back for further modification consistent with its opinion. Read the Ninth Circuit decision.
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The result is not an end to every App Store commission, nor does it make U.S. iPhones unrestricted marketplaces for alternative app stores. The litigation chiefly concerns steering and external purchase links. Apple’s latest filing identified in this coverage, for the quarter ended March 28, 2026, describes the case as ongoing and discusses the Ninth Circuit’s modifications. Apple’s filing provides the company’s account of the legal proceedings.
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The European Union is a separate case
U.S. court orders should not be confused with the European Union’s Digital Markets Act (DMA). On April 23, 2025, the European Commission fined Apple €500 million in connection with DMA anti-steering obligations and ordered it to remove technical and commercial restrictions that prevented developers from directing users to alternative purchasing channels. Apple has disputed the Commission’s conclusions and appealed, according to its SEC filing.
EU rules also address alternative app marketplaces and other commercial terms that do not apply in the same way to the U.S. storefront. Epic has argued that Apple’s EU requirements, fees and installation warnings make alternative distribution unattractive. That is Epic’s position, not a neutral finding that all alternatives are unworkable; see Epic’s account of the EU rules. The EU DMA, the U.S. Epic injunction and the U.S. Justice Department’s separate smartphone antitrust case are distinct proceedings.
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Apple’s security case is part of the trade-off
Apple presents App Store review as a way to protect users and developers through safety, security, privacy and quality controls. Its guidelines also describe Apple’s role in reviewing apps and set requirements for app functionality and distribution. Centralized review and payment infrastructure can support malware screening, fraud prevention, parental safeguards, refunds, subscription management and a more consistent user experience.
Those benefits do not settle whether every restriction or fee is necessary or proportionate. The policy question is whether Apple can preserve meaningful security protections while allowing more competition in payments, customer relationships or distribution—and who bears the costs if safeguards are weakened. Alternative billing could lower a developer’s platform charges, but it can also bring payment processing, tax, fraud, customer-support and conversion costs. A court’s ruling against particular anti-steering restrictions does not prove Apple’s security concerns are baseless; equally, invoking security does not by itself establish that every commercial restriction is justified.
What founders and investors should assess
For a founder considering an iOS-first business, the useful response is to model exposure rather than assume either that Apple’s rules make the business impossible or that a court ruling has removed platform risk.
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- Map revenue to rules: Separate digital subscriptions and in-app purchases from physical goods, real-world services, advertising revenue and enterprise sales. Identify which transactions could be subject to Apple’s payment terms.
- Test the channel mix: Ask whether customers can discover, onboard and pay on the web, or whether the product depends on native installation and features such as push notifications, background processing or health integrations. A web-first route can increase control but may reduce convenience or reach.
- Budget for more than the headline fee: Compare Apple billing with the full cost of external billing—including payment fees, tax handling, fraud, support, entitlement management and the extra customer steps involved.
- Plan for review and policy changes: Build time and cash runway for App Store review, possible rejection and compliance work. Do not make a launch forecast depend on a disputed external-link or alternative-payment implementation without checking the current rules for the relevant country and app category.
- Reduce single-platform dependency where practical: Consider whether Android, web, desktop or direct enterprise distribution is a realistic second channel. A second platform can improve resilience, but adds engineering, support and acquisition costs and may not reach the same customers.
- Track customer and billing operations: If supporting multiple payment systems, determine how the business will handle renewals, refunds, cancellations, tax, account access and customer support consistently.
The most exposed businesses are generally those whose digital revenue depends on iPhone users and whose economics require control over billing or customer relationships. A company selling physical products through an app, or enterprise software distributed outside the consumer App Store, may face a different set of constraints. Even a startup that avoids Apple billing may remain dependent on Apple for access to iOS users, system capabilities and the rules for installation.
What the claim means for startup growth
YC’s strongest argument is about optionality and investment risk. A startup can be less attractive if a platform owner has substantial influence over its distribution, monetization and customer relationship, especially when a small team has fewer resources to absorb compliance costs or a delayed launch. But that is a plausible mechanism, not proof that Apple has caused a measurable decline across the startup ecosystem.
The legal developments have created more room for some external purchasing links in the United States, while preserving limits and leaving Apple able to charge some commissions. The EU has a separate and broader framework for steering and alternative distribution. For founders, the practical lesson is to make platform dependence explicit in the business plan: know which sales are exposed, what alternatives actually cost, and whether the product can survive a change in the rules.
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