People (users and developers) have a right not to be adversely affected by unfair competition. Apple has a monopoly on selling iOS devices because of Copyright

People (users and developers) have a right not to be adversely affected by unfair competition. Apple has a monopoly on selling iOS devices because of Copyright law - and that is how Copyright law is supposed to work. Apple develops iOS, and so aren't breaking any laws by making their App Store the default. Apple operates their App Store; selling access to the App Store under reasonable terms is also perfectly legitimate. However, a particular sequence of actions can be illegal even though each of the individual actions that makes it up are legal. It is legal to ask someone nicely to stand in front of you (obviously they don't have to), and it is legal to move a knife and twist it in front of you; that doesn't mean it is legal to do the first then the second! IANAL, but Apple's conduct around the 30% charge, while made up of individually legal actions, appears to be a straightforward breach of US anti-trust law. 15USCs14 (part of the Clayton Act) says that it is illegal to sell something on an agreement that someone won't purchase something else. So making developers agree that they can buy App Store services unless they don't buy payment processing for use within their app from anyone except Apple is not allowed in the United States, if the effect "may be to substantially lessen competition or tend to create a monopoly in any line of commerce". Even if it wasn't illegal, it would still be wrong to try to lessen competition for their advantage, and it would be entirely appropriate for developers to criticise Apple heavily for it.