Sakura Dungeon and the fist two Sunrider titles are also 'games' (eye of the beholder-style dungeon crawler and turn-based strategy) games that would have to be taken down, if Valve ever does take that position.

Hell, I think the first Sunrider is Stallman-friendly under the GPL/CC-BY-Whatever. And the two Fate visual novels that just got put on GOG are not pornographic at all.