This was implicit as an intent in the public statement of Ek, Spotifys CEO, when he said that they're not gonna ban AI-generated music per se (and there already is plenty on Spotify).

Somehow this nudged me a bit when I switched to YTM, although the bundle with YT background playback on iOS was probably the bigger nudge. There's plenty of AI-generated music on YouTube as well, but for the moment their recommendation algorithm and catalogue is just better for me.

For now, it also doesn't seem to suggest me any AI-generated music whenever I use autoplay or suggestions.

I'm not falling for the illusion that this won't change though.