Without seeing Apple's books, no one can know what they use the money for. We don't know if Apple could charge 5% commission and that might cover all the fees of running the App Store. The profits from the iPhone by themselves likely cover all the costs of iOS development and then some. Apple's gross profit in the quarter ending September 30, 2023 was $40.427 billion on revenue of $89.5 billion. Don't know what the net profit is, but once source said they had cash reserves of $61.55 billion at that time, while another said $162 billion; either way, it's not unlikely that they could get away with dropping their commission if they wanted to. Like I said in my previous post, I think it's a fundamental philosophical issue with them that it be at or around that 30% number.
And I have no problem with that. I don't know what the right commission is. I don't know what reduction would pacify any regulators who think Apple is being, what was the term? "Maliciously compliant"? (I'm too lazy to look it up.) I just think their stance might come back to bite them.