What’s important to remember is that this sort of arrangement wasn’t always the case. Up until early 2011, you could buy Kindle ebooks directly in the Kindle app on iOS. As first uncovered by the Verge, two sets of emails included in the internal documents include conversations between Steve Jobs, Phil Schiller, and other Apple executives regarding this situation.

In a separate email, Schiller said:

“It’s time for them to use our payment mechanism or bow out,” Jobs said in a separate email. In response to an email from Cue, Jobs also emphasized that iBooks would be the only bookstore on iOS devices:

I think this is all pretty simple — iBooks is going to be the only bookstore on iOS devices. We need to hold our heads high. One can read books bought elsewhere, just not buy/rent/subscribe from iOS without paying us, which we acknowledge is prohibitive for many things.

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