Earlier quoted context omitted.
I'd argue however that Spotify's song recommendation engine is one of its differentiating factors. I'm always hearing friends rave about how much they love each weeks discovery weekly playlist.
AFAIK all of the major players have this feature and even developed it a while ago : Google Music have been displaying some kind of 'I feel lucky' button for ages (it is not random but based on your listens). They also had artists maps years ago. Deezer has its Flow Apple Music has 'for you' Etc .. There are many variations in how these recommandations are surfaced to the user though. I would be hard pressed to recom…
It seems to me that Google Play Music's recommendations are based on what artists you like, based on machine learning, but not using the actual music, just pattern matching with other people.
I use Google Play Music, and am actually considering trying Spotify to get better recommendations.