Exactly, it's the classic bait and switch. Now after spending the time, money, and effort involved in developing the apps developers are forced to either cut their losses and abandon ship, or continue giving into Apple's demands.
Let's see the numbers for books on Kindle and compare notes.
Kindle is a tougher call. I think Apple may try to pull them and see if they can do it or not.
That depends on whether or not you believe what Steve said in the keynote about having over 90% of the tablet market.
I was addressing the claim about market share and only that.
IE. What if Apple decides that they'd rather have only the top 1 or two apps for a category? That having only one throwing physics game, or one tower defense game, is what customers really want? Sure, that's ridiculous, but it's not THAT far from Apple's history.
Or, maybe apps that let you play musical instruments compete too much with the new Garage Band.
The point is, there is no limit to what Apple can change.