Earlier quoted context omitted.
I can even go along your last point. But it's a different argument to say "going through google is more efficient" or to say "you can't not go through google". Frankly, they're using their market dominant position to force free developers into a distribution model that serves them as the payment processor. I'd not go so far as to argue those are separate businesses, but it's really a blatant abuse of their power. Arg…
Why is it an abuse of their power? Google and Apple are essentially saying that if you use their store as a sales funnel then they take a 30% cut, and they enforce that by being the sole payment processor on the store. Basically Google and Apple both know that people will make more money by listing in their stores and taking a 30% cut than not listing at all.
This is an old claim by now, but these platforms matter a lot today, and since we only have two of them, and they are not in direct competition (users cannot switch at will) they really should be treated as the monopoly infrastructure that they are. What that means concretely is subject to negotiation within society. In my opinion blackmailing the devs of an application that is essentially written and maintained as a service to the public, for free, by volunteers, is a shit move to say the least.