I keep getting served some supremely mediocre eastern European hip-hop in Release Radar and other Spotify-generated playlists because of some guy who performs as Devo. Same with guys performing as Slayer, Poe, etc.

A lot of the time they're listed on the track along with two or three other people, so I go to the pages of those associated acts and tap the "don't play this artist" option in the three dots menu, and that usually cuts down on how much I see them in my feeds. At least until they do a new collab.