You bought the hunk of metal and glass, but you didn't buy the app store servers, the software has a legal agreement and you sign that.
If you don't agree, don't sign it.
If you don't agree, don't sign it.
I understand a one time fee ($99 or something) for hosting the app and allowing downloads, but why does Apple get an ongoing 30% cut?
And of course the absolutely massive SDK that makes it easy to build all these apps natively without rolling your own computer vision framework or audio processing engine.