There is an incredible amount of trivialization packed into the phrase "monetize your clone of candy crush" when referring to the App Store which has tens of billions of dollars of revenue per year.
But it's worse, because it impacts you even if you're not an app developer. Even when you think you're paying other people, Google and Apple often assert that it has a right to the cut, like joining a YouTube membership. When apps are pushed to use IAPs with a cut, you wind up paying more and having less of it go to the intended recipient, and because apps are limited on what they're allowed to communicate, they can't really adequately warn you that this is going to happen. Some smaller apps wherein the IAP cut seriously doesn't make sense, more along the lines of banking, wind up having to just give up altogether on accepting payments, because they simply don't have the power to fight Apple and Google when they get wrongly rejected.
App stores that don't even let you tell people they're being ripped off by app store policies feel like things that people in "hacker" culture would not be apt to defend as good even if they believe it is completely legal, and I sincerely wonder how this became the norm for a lot of people.
I think people making apps with infinite IAP are the scourge of modern society. People here on HN complain about SaaS software and the eternal renter mentality, but the IAP is not thought of in the same manner strikes me as odd. So with that said, we'll probably never see eye to eye on this topic.
I'm not really sure how that applies to the examples I gave, of which the main ones are basically the same idea as Patreon and have nothing to do with those IAP practices.
I'm also not sure why some of these transactions potentially being scummy makes it any better the way Apple and Google control the markets. If anything, they're profiting hand-over-fist from it and absolutely encouraging it.
To be clear, I don't really lean to one side or the other on this, I just find it interesting that both of these are common views to hold.