It may be worthwhile for us to look into it, but everyone has their own favorite creative commons license so we risk offending people if we choose just one, and choosing multiple would likely complicate things for us in the future. IANAL, but some CC licenses, like one prohibiting commercial use are difficult to use/enforce since usage is difficult to define. Another issue is that if a creator wishes to regain control of a work, CC makes it difficult since the license is (as far as it was explained to me) perpetual over the term of copyright protection.
We have plans to add guide forking and merging in the future, so the licensing will need to allow derivative works. Our current license allows that while trying to still be reasonably fair to content creators (in particular due to the non-exclusivity). Since many car guides may begin by lifting the hood and removing the dust cover, they should be able to all fork from the same starting images, for example. There's also thumbnail generation, marketing screenshots of pages with guide images, etc.
So what if the original creator of a guide that has been forked and edited multiple times decides to revoke the license? Wouldn't you have to delete all forks and edits?
That's why FOSS and CC licenses are perpetual; to avoid building on potentially shifting sands.
We have plans to add guide forking and merging in the future, so the licensing will need to allow derivative works. Our current license allows that while trying to still be reasonably fair to content creators (in particular due to the non-exclusivity). Since many car guides may begin by lifting the hood and removing the dust cover, they should be able to all fork from the same starting images, for example. There's also thumbnail generation, marketing screenshots of pages with guide images, etc.