Nor should they require developers to release apps in Apple's App Store. In that case, what' the point of opening up access to the platform?
If a developer chooses to move to a different app store, he or she risks losing customers. If the developer makes the move, customers will have to decide if Apple's walled garden is important enough to stop using the app (and find an alternative in the App Store). That's freedom (for the consumer, not the corporation). That's how things work on every other computing platform.
I'm not against Apple making money from the App Store. My objection to the App Store monopoly has nothing to do with what Apple charges, percentages, etc. I object to a platform gatekeeper who, at the flick of a switch, can disable an app and silence people, cut them off from services, etc. For me it's not about Apple, but the obvious, inherent dangers of such a system and allowing such a model to become accepted (and replicated in other industries). That's a sure fire path to the dystopian future we see depicted all too often these days.
On the one hand, Apple fans sing Apple's praises when it comes to security and privacy, yet they think so little of Apple that they believe the entire iOS platform will become a wasteland of malware if third party app stores are allowed. How can both be true? And why isn't the Mac a wasteland of malware?