The linked post shows how most non-tech people’s understanding of email is very very different from most of the people here.
First of all, users don’t want to have to block people before having a good experience.
In general conversation in distributed protocols is opt-in, not opt-out. If you see something you don’t like in Briar/Tox/Jami, then it is only because you actively seek it.
Okay, but that is not how the fediverse/Lemmy works at all and I don’t think Nostr works that way either. You can easily see content that you did not explicity ask for (i.e. comments/posts from any user) and I don’t think Nostr is different in this aspect (though I could be wrong).