I wonder how much of this is really Valve's effort into making Linux a Gaming platform and how much is just to put pressure on Microsoft to relax the policies o

I wonder how much of this is really Valve's effort into making Linux a Gaming platform and how much is just to put pressure on Microsoft to relax the policies on Windows 8 that would make the Steam model invalid. If this path will lead to a world where gamers don't depend on Windows, that would be awesome for users and really stink for Microsoft.