I read an article recently that claimed that for major genres most of the songs suggested by Spotify are from "fake artists". There are people making music for Spotify for a fee which allows Spotify to keep the cut that would otherwise go to a non-Spotify entry.

It seems like the formula for an acceptable song is well understood. With the necessary push provided by Spotify these songs get streams in the millions easily. Perhaps it's cheap enough to have this music produced that they don't even have to move on to machine generation.