Saying they don't have a monopoly over those services is still a stawman. They don't have a monopoly on music streaming, but they actively force Spotify to effectively support their own competitor via their 30% fee. Apple TV+ does not have more subscribers than Netflix, but apple famously makes rules that hinder Netflix ability to be competitive on iOS.

And if Apple was all about making the better product, why don't they allow the app developers to use their own payment processors. If Apple IAP was so superior to everything else, users and developers alike would surely gladly pay the 20x markup?

But heck, they don't even allow an App developer to tell their users about a cheaper price on their website or why the product is more expensive on iOS.

Wether you like it or not, as soon as a platform becomes as big as iOS or Android, market watchdogs will come to town. And that is good thing, because with competition the user usually profits over the long term.