Breaking the user experience for competitive apps and not even allowing them to explain why goes far beyond encouraging people to use in-app purchase. For that

Breaking the user experience for competitive apps and not even allowing them to explain why goes far beyond encouraging people to use in-app purchase. For that matter, using in-app purchase is only favorable to users who stay entirely within the Apple ecosystem. One serious objection Amazon et al had to in-app purchase is that it (by design for privacy reasons, IIRC) didn't allow them to connect the dots between an iTunes account and an Amazon account, so they wouldn't have been able to give you access to your iOS-purchased ebooks on non-Apple devices. For that matter, they wouldn't have been able to give you access to your ebooks on a Mac for the same reason, which is particularly hilarious because Apple doesn't provide iBooks for Mac either (IIRC, you can buy but not read on the desktop).