> I've purchased plenty of music, but the problem is that at least on iOS, the music app will still swap out song/album/info/art, or mismatch them altogether.

I wonder if another app might solve your issues? Certainly my combo of Navidrome + substreamer (on Android) doesn't have any of those issues. My music is tagged and has embedded artwork and the app just uses what's there. Then I just use MusicBrainz Picard to ensure my tags are clean and in good shape.

> My favorite way to support artists I love is to go to their tours and buy their merch, including vinyls that are too cumbersome to actually listen to :D.

This is the way!