There are unironic paedophiles on nostr.  I'm not saying it's as big a problem as the spam but they're definitely here, along with people who may just be posting csam to be edgelords or to hurt the protocol. 

 I've only ever seen one and he moved here from Pleroma. 

 It's entirely possible there are more though. It's kind of impossible to find anyone on here unless you just stalk global, or follow people indiscriminately.