I’ve tried it a couple times, it’s neat, lots of features, but that makes it a bit confusing. I’ve also had trouble finding a stable English speaking general purpose server that’s reliable, all the one’s I used were down more than they were up. You might want to look at Calkey or whatever they’re calling it now, that’s an active fork.
This is also why Tumblr maintains it’s ban on porn, Visa and Mastercard exclusively process their own cards, and wield that as a weapon against what they don’t like.