Sure, Amazon is the poster boy for getting screwed here. But they aren't the only ones getting swept up in this nonsense.
I'm just saying, I'm not Amazon. I'm a content company that sells content to users in print form, and on the web (primarily on the web these days). Customers can only get to my content if they subscribe. Most of them get to that content via our website. Pretend I'm the Wall Street Journal (but I'm not).
I'd like to make a IOS app to allow my users to get to their extremely expensive content in a native application, but now that I have to pay a 30% tithe to Apple, I won't do that. Now I'll make a web based version which will suck more, and we'll let that ride until Apple pulls that out from under us too.