I use a combination of Spotify discover weekly playlists, related artist lists, and lately I’ve been finding a random new category that Spotify curates and then searching for playlists of the same type that are curated by users. I think I get more deep cuts that way.
As for the last part, if Linus from LTT is to be believed (I usually trust his opinions), on the WAN show they were discussing this just last night and he said that the majority of YouTube premium revenue goes to the creators. Or, rather he said that YouTube doesn’t pocket the majority so there could be some tricky nuances in there somewhere but he seemed to indicate that the creators get more than YouTube does in that deal.