They are a pain in the ass.
I don't think they will do a tumblr (or the last one to try it, OnlyFans) because their business amounts to ~$25 monthly million in public pledges (they get 8%-12% from most publishers, so we can assume 10%, $2,5 Millions/Month). It's impossible to know the hidden pledges, but there is a lot, as a lot of publishers hide their earnings, especially the successful ones.
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Adult gaming is around 9% with ~$2,2 monthly million. I would say the hidden earnings are proportionally higher here. I guess somewhere around 30-40% is hidden.
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But the whole adult community (comics, writing, photo, video, etc.) adds up to ~$7,2 monthly million in (public) pledges. Roughly (without taking into account the hidden earnings) 28% of their business.