I used Pandora for a long time. I was relatively happy with it. I usually start with someone's existing station and then thumbs down and thumbs up the various songs to fine tune it to what I like.

After years of hearing about Spotify, which I thought was a paid service, I found out it was free. I decided to give it a go. I created an account and signed in and picked a channel of what was popular on Spotify.

The very first song was one I didn't like. I tried to skip it and couldn't. I tried to "thumbs down" it, Pandora style, so it wouldn't play that song again. No such feature. I looked for a way to never play music from that artist. I couldn't. I left Spotify after less than one song.

With how aggressively they seem to shove music you don't like in your face, I am not really surprised they aren't doing well.