Some iOS restrictions are obviously simply business driven, but fewer than you might think. E.g. The "give us 30% and don't undercut" rule means that the user

Some iOS restrictions are obviously simply business driven, but fewer than you might think. E.g. The "give us 30% and don't undercut" rule means that the user can buy from the app store without needing to price compare. The "no execution of outside code" rule means no platform subversion with the endless security issues this would bring. If you stop thinking in terms of technical capabilities and start thinking in terms of the user's cognitive load, iOS is a huge step forward in terms of abstraction.