I’ve never had Apple Music add random songs to my library and the closest thing to an AI DJ is AutoMix which is easily disabled and I’ve never had it re-enable itself. Can also add your own music to iCloud Music Library with the Apple Music app on Mac and (I think) Windows. Think this requires iCloud+ though but I’m not 100% certain. Annoyingly can’t do it on the web app or an iPhone :/
I don't think it requires an additional subscription. Apple music started as solely an "upload your music to play anywhere" service. I use apple music over the other offerings solely for this feature and for a large portion of it I didn't even have any apple devices and so didn't have iCloud+.
Good to know there's at least one sane streaming service option left out there, although at this point I'll stick to my physical media. I've been burned by music providers enough times to think that Apple will eventually follow the same path as the rest.
