$Apple(AAPL.US)$ faces real, but limited, risk to its revenue and profits from Friday's ruling that requires it to allow developers to offer alternative payment methods for purchases made in apps downloaded through the Apple app store.In a case filed by Fortnite publisher Epic Games, U.S. District Judge Yvonne Gonzalez Rogers issued a permanent injunction that requires Apple to allow developers the option to include links to alternative payment methods in their apps. Apple's own payment system takes a 30% cut from large developers.Data from the app tracker SensorTower shows that in calendar 2020, Apple had overall revenue from the App Store of $72.3 billion, generating an estimated $21.7 billion in fees, or about 7% of Apple's overall revenues. That includes $21 billion in spending in