I don't understand why they have to bundle ad-free viewing with YouTube music. Nobody is going to switch from Spotify or Apple Music to YouTube.
The YT music app feels like a poorly reskinned YT app. Impossible to get basic album info, song titles are often wrong (live versions not marked, covers appearing to be original, etc.). So many "fan" releases which are often just lower fidelity copies. And search is, ironically, abysmal.