These guys? https://en.wikipedia.org/wiki/Kiwi_Farms If their availability suffers a little, it doesn't seem like a grave loss for the internet. It's not like there's a world-wide shortage of websites.
Secondarily, I don't see anyone else-- journalists, politicians, NGOs, anyone-- doing this kind of deep dive into the sort of online harm Keffals represents. Grooming young children into bathtub-gin sex changes behind the backs of parents and doctors is monstrous. If the only people documenting this are Internet trolls on KiwiFarms, all the more reason to defend their civil rights until the rest of society comes to its senses.