Any cut of money that developers and users cannot avoid when trying to transact with each other should be disclosed, yes. But Apple's is the only such cut in th

Any cut of money that developers and users cannot avoid when trying to transact with each other should be disclosed, yes. But Apple's is the only such cut in the entire iOS ecosystem. And it should also be disclosed when companies are forbidden from informing you of a cheaper way to purchase from them. Again, Apple's is the only such restriction in the iOS ecosystem. If other companies fell into the above categories, certainly that would be worth disclosing as well.