It's worse than that - they want you to think that all filesharing of music/video is illegal, which isn't true either. The trouble is, the music and video content that doesn't come from them and is perfectly legal to share is in fact produced by their competitors. So in stopping you sharing 'their' content, they also have an incentive to stop you sharing anybody else's content. Sharing of linux distros or software is really an irrelevance here, what they're really doing is trying to stop Joe Public's mindshare from drifting away from them and their offerings.