This is height of hypocrisy since Apple apparently uses Amazon S3 in their iMessage app, according to an earlier HN post that links here : http://imgur.com/fwXX5
I'm not defending Apple but your point is completely irrelevant. They don't want products in their store to mention a competitor. That has nothing to do with them using a service which they don't have a competitor for.
What I meant was that Amazon is a competitor to the iBookstore (so naturally Apple would prefer not to sell products which mention Amazon). I was pointing out that Apple using Amazon's cloud services is irrelevant because Apple does not compete with them on that product.
"You can't mention Amazon, but we can use it."