I once had a row with a guy who claimed one can't make a living by giving up on some copyrights and not being gung-ho about demanding everyone who copy or use their work without compensation pay up.
He ended the argument with a pissy fit claiming that I am not a creator, that I don't contribute anything so I don't have a say in the matter, and wouldn't have another word from me. (Not entertaining the thought that I may have been participating on the Internet for a lot longer than him, contributing tirelessly without any compensation.)
Anyway, lately with Steem I am fairly confident I finally have an upper hand on those kinds of conversations. I can both contribute, and get compensated for my work, so why shouldn't I release my photos under free licenses?