A lot of that music is now payola, placed into those "organic" autoplays via Spotify Discovery Mode, which requires artists and labels to take a 30% discount on royalty rates for their music to be played in this context.
Neat, didn't know about that program, thanks. It seems Discovery Mode is more tailored towards their Spotify-generated playlists/radio but also seems to mention Autoplay.
I think that further underscores my point of having a varied playlist, since you're only eligible for Discovery Mode if you have >25,000 listeners.