I think that is in fact exactly what GP is suggesting.

I don’t read it that way. I think the point is it doesn’t make sense that apple is taking a cut of a transaction that is not in their payment rails*. Apple can still be compensated for their App store service without using a model that takes 30% of all transactions, e.g. a listing fee, an app review fee, etc.

*And anything on their payment rails should have a normal transaction fee, e.g. Stripe’s retail rate is 2.9% + $0.30.