All primal has to do is actually search and use their platform I told the main guy just to search for preteen and he will find it bit that's too complicated for Primal

They use a service or API for it I believe.

They have some AI porn detection thing. Only paid accounts are allowed to upload porn.

I’ve spent and continue spending a large portion of my time on that problem. We have at least 3 automated mechanisms to identify offensive content, and the last layer is human-driven. It is not easy or cheap, but alternative is magnitudes more expensive. Hope that answers your question

Nostr build do not promote childporn so they don't host it. That's really all the difference is