Yes, it's loli/shota/cub friendly. It's run by the same people who run Bad-Dragon and E621. It's basically the online roleplaying website! At least from my understanding.
Have you looked at F-list? It can be a bit of a pain to get the hang of it, but once you do there's usually not a problem finding a partner, especially if you're playing a female character.
This is probably one of if not the most respectful defederation we've had. Their reasons for doing this are very understandable, and they even said they would refederate once they have the ability to block individual communities, which are illegal in the jurisdiction they host in. Honestly, very pleased with this mature stance on defederation.
I assume you're mining in a pool? If so, may I ask which one you're using? Definitely not a small reward in my opinion, this would be of use to me, especially since I have servers and SBCs just sitting there doing nothing. Might be worth getting them setup.