A big part of it is that the more people listen to their generated content, the less they have to pay actual artists.
And it’s why they have one of the lowest average royalties per stream.
Music streaming companies with active anti-AI policies are: Qobuz, Tidal and Deezer
Bandcamp is always worth mentioning if you want to buy music directly
From Spotify to fair music streaming has everything you need, with a few options to transfer your likes and playlists