If this is a topic folks are interested in, I'd highly recommend Liz Pelly's new book Mood Machine. She did a lot of research in this area and really lays out how Spotify is destroying discovery and music community in the name of profits. Honestly it's horrifying, way worse than most people would assume.

An excerpt was published in Harper's too.

She also did an interview with Anthony Fantano, but I haven't watched it.