When you build a platform and it becomes so successful that it forms part of the foundation for an entire society's technological existence, you lose the privilege of arbitrarily controlling that platform. Electricity companies don't get to skim 30% off of the revenue of any factory that makes widgets using the electricity company's electricity. Cell phone carriers don't get to skim 30% off of any orders placed over their networks. Apple shouldn't be able to skim 30% off of every transaction that happens to be made on an iOS device. I don't give a damn about esoteric arguments about Apple being a "private company" or whatever: it's unacceptable for society to pay a 30% tax to Apple on a big chunk of the economic activity of an entire society. No taxation without representation, right?