A child porn instance would have cops breaking down the server room door

Burggit.moe does synthetic child porn, stuff like loli/shota material. That’s First Amendment-protected in the US (and in the Netherlands, where the server says that it lives), but is illegal in a number of countries in the EU.

piracy-friendly instances

lemmy.dbzer0.com was created specifically to do piracy stuff, and is one of the major Threadiverse instances. And db0 himself has contributed a fair bit of software to improving Threadiverse infrastructure:

github.com/Fediseer/fediseer

github.com/db0/fedi-safety