Very weird comparison.

GPL was made in response to restrictive commercial licensing. Yes is uses the same legal document (a license): but is made in response!

So is propriety seizes to exist, then it's not a problem GPL also seizes to exist.

Also: it's quite obvious to me that IP-law nowadays too much. It may have been a good idea at first, but now it's a monster (and people seem to die because of it: Aaron Swartz and Suchir Balaji come to mind).