Considering 99.9999999% of my mp3's are from ill gotten means, I never had that problem, or even Apple music* scanning my files.
Apple Match, however, will fuck your shit up
*That said, if you've got start playing files you have the physical copy off in itunes off apple music stream it does get weird. I remember how i couldn't get Drake+Future to stay on my ipod because it would get 'confused'. I assume because when you stream it saves a copy of that mp3 so you wont have to re-stream it and then it conflicts.
>https://blog.vellumatlanta.com/2016/05/04/apple-stole-my-music-no-seriously/ > >This is the important part: > >"... What Amber explained was exactly what I’d feared: >through the Apple Music subscription, which I had, Apple now >deletes files from its users’ computers. When I signed up >for Apple Music, iTunes evaluated my massive collection of >Mp3s and WAV files, scanned Apple’s database for what it >considered matches, then removed the original files from my >internal hard drive. REMOVED them. Deleted. If Apple Music saw >a file it didn’t recognize—which came up often, since >I’m a freelance composer and have many music files that I >created myself—it would then download it to Apple’s >database, delete it from my hard drive, and serve it back to >me when I wanted to listen, just like it would with my other >music files it had deleted..." > > >http://static.gamespot.com/uploads/original/1188/11888561/2442643-0604742403-35818.gif > > >--------------------------- > >"Where was the peace when we were getting shot? Where's the >peace when we were getting laid out? >Where is the peace when we are in the back of ambulances? >Where is the peace then? >They don't want to call for peace then.