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Custom ROMs have had just about enough of being Android's second-class citizens
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
You can fix most apps with the Play Integrity Fix module and denylist. You might have to hide the magisk app too. It doesn't get 100% of them though, I still can't figure out how my bank app is catching it. Plus I've had RCS stop working with that setup, so I have to keep it disabled to avoid missing messages
The apple music app checks for a specific binary. Could be something like that.