I never understood this well. For example the case of YouTube mp3 (http://www.youtube-mp3.org/ http://www.youtube-mp3.org/). In past Google tried to stop YouT

I never understood this well. For example the case of YouTube mp3 (http://www.youtube-mp3.org/ http://www.youtube-mp3.org/). In past Google tried to stop YouTube mp3 because of violations to the YouTube Terms of Service, but, if it is true that it only suffices using someone else's trademark in a domain for the owner to shut your domain down, then why did never Google attack it on this side?