Child porn isn't speech though. So I am not sure I follow? Like I said, NOSTR as a protocol and its relay's could 100% send out child porn, you would also need to host it or find a host that doesn't care you host it. The protocol cares not. There is no governing and central force against it in any way. There can't be. I am also not all together sure there isn't child porn on some relays, perhaps paid or private. Who knows?