This is interesting to me because i just today read the terms of service for the new FF14 expansion, which explicitly includes the terms that derivative works are property of SE, and they can demand that you send them the works or destroy them. (I don't especially have fannish feelings for the game so it's not bothering me, and I know that "random fanwriters doing it for love" is not what they're aimed at--more the JP market for doujinshi and art sold at conventions, as you've mentioned--but it's still interesting.)