It seems like you've set up an opinion where Apple Music is not allowed to exist in any form because Apple obeying the App Store rules like any other app is not considered enough.
I have no problem with Google Play Music/YouTube Music because those are treated like equal citizens with Spotify on Android. I think it’s better for everyone if Apple Music’s competitors weren’t at a disadvantage just because Apple makes the platform, and I say this as someone who owns many Apple products.
There are many instances where competitors are more or less disadvantaged because the owner of the platform is also competing. Does your favorite supermarket have a store brand? Are you against that?