I think that's a very interesting question.
But I think that the GNU FDL doesn't let the user add more restrictive conditions. If there are more restrictive conditions having to do with not violating some laws, that's a different issue from GNU FDL issues.
So I don't think there's a problem.
I think it'd be great if there were a large community of GNU FDL paparazzi. Individual little people fan sites are constantly harassed, and rightly so under the copyright laws, for stealing pictures. It'd be neat if there were a repository of GNU FDL photos that fans could use without permission.
--Jimbo