I would suggest that a project run by an foundation whose entire purpose is Free Software and which strongly prefers making its own software available under exclusive reciprocal license for ideological reasons tied to it's central purpose has a very different position with regard to securing contributions of code ownership from people interested in contributing to the community than a company licensing software under a GPL+proprietary scheme, whose implicit ideology is “we should get paid by commercial users for what we develop, but you should not for what you develop for us”.