I've never seen a company crack down as hard on a community for putting the game's music on YouTube. The company cared not one bit when 1.0 was around, but now that you've launched the game again, any mention of having any piece of sound from 1.0 or 2.0 and you come down hard with copyright claims.
It seems a bit excessive. Especially considering you have other MMOs or games with full soundtracks up and absolutely no issue has been brought up by the company. If you're so concerned with lost revenue, then why not just put ads in the videos and be done with it?
The only reason I can fathom is a release of the soundtrack in digital media will be forthcoming. If so, then fantastic! I'll be buying it, as the music is great.