I don't believe they have to mention that it is free. I wish the thing was called the Free Code GPL so it was more obvious.

Don't forget there's a lot of end-users out there that still don't trust something unless they pay for it. (I wonder if that means they trust hookers more than wives? ...hrmm). So people who might not otherwise hear or know about your code might be more apt to use it if it's 'Distributed'.

Anyways the GPL at least keeps them from claiming it's their code, and those that know how to do it free are able to.