> I assume that some of the music that's showing up in my Spotify feed is AI-generated but I've never noticed.

A lot of it is now, and it's frustrating to me. The worst part is that I'm not actually anti-AI-music. There's one or two "groups" ("producers"?) I've found where it's clearly AI but they've put a lot of work into making something worth listening to, but Spotify seems to have a "this sucker will listen to the cheap stuff" flag and now I'm drowning in tracks from people who paid for Suno and think that's enough.

I'm not sure about the flag :D but I've had pretty good results with always making sure to flag every artist in AI suggestions with "don't play". You have to visit the artist profile pages to do it though, so it remains a cat and mouse game, but I think that as long as they don't prevent it by force, doing this tends to improve the AI suggestions (of non-AI music).

Similar to YouTube slop.

If that would stop working, I'd cancel Spotify again.

Speaking of YouTube slop, I think Spotify has had its own system of preferring cheap muzak from labels they support since before GenAI music even took off, I think. Example label: Firefly entertainment (IIRC)