You speak as though app developers are swimming in money, but the fact is that the App Store market is very top heavy. As usual, "the 1%" are doing extremely well, but the vast majority of app developers are not making a lot of money. Apple's recent small business program is tacit acknowledgement from Apple that many developers are struggling financially and cannot afford even the 30% cut.

In comparison, the so-called "gig economy" is also extremely large, perhaps even larger in total dollars than the App Store, but that doesn't mean individual gig workers are doing well.