Plex also supports music libraries, but I don’t use that feature. Why? Because Spotify has literally 99.9% of all the music I want to listen to, and aside from maybe like Garth Brooks, the other 0.1% is on Youtube. Spotify did it right by just having a basic service that you can pay for and get everything you want. If I had to subscribe to Spotify, Tidal, Napster (Still a thing I guess?), and 4 other services just to access all the music I listen to, I’d go back to piracy.
Spotify also has a free ad-supported service, which while it does have ads, isn’t as bad as radio, or needs you to go to the effort of pirating the music you want.