My wife is a (professional) musician. She has achieved some organic popularity and her music has been in TV/movies, but having some songs featured on curated Spotify playlists has been one of the most profitable things for her career. Musicians rightfully complain that spotify pays fractions of a penny per play, but if your music ends up on a front-page playlist for months/years you can at least make many thousands o…
The argument here is that Spotify is adding to their curated playlists songs/artists that they do not need to pay royalties to. So they end up paying out less royalties to musicians like your wife
And royalties are paid from a revenue share model AFAIK, it's not a strict 0.0X cents per stream, etc.
It's probably a bit of a better deal than the royalty agreements with the big 4 record labels, but I'd be surprised if it's so much so to organise this sort of conspiracy.