Mullenweg's the same guy who publicly harassed a random transwoman on Tumblr and had a general meltdown to the point where Tumblr staff had to distance himself from him, so I'm not shocked.
(That its Tumblr is the only thing that shocks me - you'd think he'd have realised its queer-friendly rep was one of the main things going for it)
Granted, Apple's banhammer forced Tumblr's hand on that front (though Tumblr's complete failure on moderation did give Apple that golden opportunity).
(The whole debacle did lead to Newgrounds getting hit by two separate waves of new users - a minor wave in November after the NSFW purges kicked in, then a major wave in December after the porn ban was officially announced. I have nothing more to add, I think it was pretty funny Tumblr shat the bed that hard)