Apple’s App Store profits on commissions from digital sales Revenue $32 B Operating Costs $7 B [1] Estimated Profit $25 B Operating Margin ~78% [1] R&D, security, hosting, human review, and including building and maintaining developer tools Xcode, APIs, and SDKs. Apple could take just 7% cut and still make 20% profits. Fun Fact: During the Epic trial, it was revealed that Apple's profit margins on the App Store were…
The operating cost is the maximum Apple can come up with when their accountants attribute everything they possibly can to digital sales for the sake of legal argument. R&D shouldn't really be included, and Apple uses those same tools and APIs themselves. I think the actual profit margin is closer to 90%, and Apple could maintain a 20% margin with just a 3–4% fee.
I like Apple less and less these days for various reasons, but I haven't purchased an app on the App Store in more than a decade. It's strictly a vehicle for local utilities when, for whatever reason, a browser will not suffice. Nearly all purchasing is done on the 'open' web.