They also have fake artists they put on playlists :P

Yes, but it's still the required correction to your claim. I actually don't know how many podcasts are using their publishing platform. I imagine it's considerably more than a dozen.

They want to own something but it's always going to be a drop in the ocean. They have a small new music label thing called RADAR but I imagine the failure rate on that is very high. They need to buy a label if they want to meaningfully change this. Just like Amazon now owns MGM and Netflix maybe getting Warner Bros. Presumably they can't afford to do this, and I don't think that integration would work as well in the music industry.