Honestly, I don’t see any reason to remove them :-/ Or we should adopt the same policy for unofficial artist page from Spotify, Deezer etc. many are also self-generated or share multiples artist under the same ID:
As YouTube Music Team is working to merge all secondary channel to the official one (when it exists), I think the addition of these topic channel is useful for the future (MB will already have the link to the official channel).
