I'm on a Mac.
I try to quit the application, it restarts.
I FORCE QUIT it, it restarts.
I go into Preferences, change the 'Open Spotify automatically after you log into the computer' option to NO then Quit it, it restarts. I check the 'Open Spotify automatically after you log into the computer' option again. It's auto-selected MINIMIZED, completely disregarding any change I've made.
I redo the previous action again then restart my machine. It won't let me because Spotify is still running and won't Quit. So I push the Off Switch, wait a little while then restart my machine. Spotify restarts.
In effect the Spotify app is now malware. Great job.
I require your assistance to help me get this piece of ---- off my machine forever.