Taking this to its logical conclusion...
We'll end up with a different video site for each music publisher which totally defeats the benefit of having every video from everywhere in one place. The result will be less traffic watching music videos because not everyone will know which artist is with which publisher and some new artists will remain low key if they don't turn up in YouTube searches.
This is bad for music fans and bad for artists. Corporate fat cats just don't get it. I bet they have a secretary to write emails and operate their computer for them.