Just some of my own thoughts:
I feel somewhat the same on a base level, BUT.
I understand that the agreement could very easily have simply to do with showing different pieces of art in advertisements for the site, and that the agreement could even be needed just simply to host the actual deviation itself - still, it opens up a LOT of doors, and given the weird legal stuff going on at devART and the increasingly corporate feel of things, it just seems stinky to me.