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Apple 30% makes no senseApple provides useful services with its App Store: filtration and curation. The degree to which this is effective is debatable. But that it has an effect is not.
Apple also extracts socially useless rents from its App Store. The degree to which this exists is debatable. But its existence, given Apple's dominance in app industry profits, is not.
The first costs Apple in terms of labor, tools and research. The second is a result of their independently-profitable devices business. These costs are roughly the same from app to app, review to review.
One solution might be to charge a fixed fee per review. This scales perfectly with Apple's costs. But it's prohibitive for small players. A scaling fee structure relative to revenues promotes first movers, thereby keeping the app ecosystem fresh. Apple came up with a 30% flat rate. This made sense when apps made hundreds of thousands of dollars. It does not make sense when they make hundreds of millions.
A simple answer is a sliding scale. 30% for the first $20mm in a year. 20% for the next $40mm. 10% after $60mm. This is more than generous to Apple. It beats Epic's request for a 12% flat fee at $400mm. And it continues letting Apple give new entrants, who are both more sensitive to costs and more needing filtration and curation, a field to play on. As a bonus to Apple, it reduces the incentive for developers to litigate as a function of their capacity to sue.