This "loophole" was closed by Apple during the last round if App Store approval rule changes back in December of last year. The Kindle app seemingly gets a pass, but a number of other applications have been rejected since then.
Isn't this what racketeering and monopoly laws are supposed to prevent? If any lawyers are on this thread, it would be great to hear their input on this.
Should Wal-Mart be forced to carry my self-published book because they carry some Random House best sellers?
Where can I read more about this?
In addition, publishers may no longer provide links in their apps (to a web site, for example) which allow the customer to purchase content or subscriptions outside of the app.