I've been a Premium user for a few years now and listen to, quite literally, 100% of my music through the Spotify app on my phone.
The other day I realized that when I choose any "Go to Radio" option (Go to Song Radio, Go to Playlist Radio, etc.) the app instead takes me to a playlist based on that song/playlist/etc.
There's no option for thumbs up/down on any song, and the top of the app literally says "Playing From Playlist."
Why am I not able to access the radio?