What's the value to do so? Relays can control what they relay. Someone could easily run a nostr child porn relay however.
Child porn is the canary in the coal mine. The only proof of a lack of censorship is the presence of child porn. No other form of speech is more hated. If you know another form of speech more hated, let me know and I’ll use that as the canary in the coal mine.
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?