I actually wouldn't be opposed to it if (big if) they hosted the content and allowed apps with subscription/content to not have any in-app purchase at all (no Apple / no flip to Safari) to avoid the 30%. This would let Netflix, last.fm, etc do their thing and Amazon to do its thing. Everyone already knows to buy books on Amazon, so no great loss not having something in-app.
this is exactly it. the problem with the rules is that apple requires any app that makes money outside of the app to also give apple a way to skim. Apple could of course just enforce this for the apps that they are direct competitors with, but that seems like an even bigger issue.
I just thought of some other things that would be effected:
google apps for business, any app that google distribs would need the option for in app payment.
