I never liked suggestions/radios on any streaming platform - GPM, Apple, Deezer, Spotify, they’re all shit.
I use streaming platforms solely for checking out new music that picked my interest on sites like RYM, albumoftheyear, anydecentmusic, Quietus, Picthfork, etc. If I like what I hear, I acquire it either on Bandcamp or on Soulseek and into Plex it goes.
No, I don’t think so. Should I? I have a vague memory about seeing Jamendo in Rhythmbox when it shipped in Ubuntu by default. It was a long time ago, I didn’t even know it was still a thing.