This seems like classic game theory. While it's in the design industry's collective best interest to never work on spec like this, it might be in an individual designer's best interest to design Gap's logo for free. And even if it's not, if most of them think it is, you've still lost. Believe me, I understand that Gap's move here is a slap in the face, but many designers out there will do it anyway, just for the chance to say they designed Gap's logo.