You're right. It's a duopoly, a cartel.
A system controlled by two players who move in coordination with one another.
techcrunch.com/2021/03/16/google-play-drops-commissions-to-15-from-30-following-apples-move-last-year
A system controlled by two players who move in coordination with one another.
techcrunch.com/2021/03/16/google-play-drops-commissions-to-15-from-30-following-apples-move-last-year
So does Yahoo, Naver, Yandex, Baidu etc. It's all very far from a cartel.
Apple and Google are not a cartel by any definition and they do not in anyway coordinate with each other. Either of these are criminal.
Google reducing their margins to better compete with Apple is no different to how every market works.
Those are commissions the stores take not what the developers take. Sure sounds like competition.
The problem is that everyone seems to have collectively forgot that it's not monopolies in and of themselves that we have to protected against but rather anti trust behaviour.
You could potentially argue that app stores do exhibit anti trust behaviour but in that case one should do so and not throw around words clearly aimed at invoking an emotional response.