These kind of services allow us to explore the full spectrum of creativity, instead of homing in on current market trends. If we do not support the outlier (or in this case leave them lying by the sidelines and ignore them), we loose a part of cultural diversity. Not everyone has the same taste, but how do you experience new things when you just follow the herd?
Coincidentally I was talking with someone about House of Cards over lunch. And whether this is correct or not, it was claimed that House of Cards was the results of machine learning and figuring out that the majority wanted Kevin Spacey and a political drama. Now if this is the future of tv, this will lead inevitably to less diversity. This would be a very sad development.
This is precisely why I think that services like this one are very important to keep us culturally diverse. (at least in the limited spectrum of songs available on spotify in this case.)