Okay. It is the content of the post that got that post barred from so many relays. People do not like one or some of the terms in that post. I can see how they might be heavily correlated with terrible spammy content. I get it. It wasn’t a spam post, but if you do simple keyword filtering it might appear to be so.
This is why developing Bayesian filtering is so important. Email is the most filtered protocol in the world, and the most popular independent filter, Spamassassin, is primarily Bayesian. I install Spamassassin on my MTA and I never get spam again. I don’t ever see it marking a real email as spam.
Of course email benefits from a lot more additional reputation signals over Nostr for the time being. And a lot of those were architected very slowly over years, like RBLs and the various ESP reputation systems.