This sounds terrible from a user perspective and arguably promotes certain types of music while penalizing others. As a user, if I hear more than a few songs that are terrible that were forced upon me by some algorithm, I am not going to listen to that playlist/use that service anymore. If users are the only way you are generating training data (for this supposed only self-published music world), you are going to end up with the music version of clickbait to get users' attention before they hit skip. I really cannot emphasize how bad optimizing for this would be for music.

Whatever your opinion on "current gatekeepers", some of them do provide valuable filtering services that I struggle to see how an algorithm could accurately replicate without compromising what makes music magical.