Comment by fiatjaf

Unlike what OP says Nostr relays are not dumb, they can have their own policies and to me they look like a better version of Mastodon servers. They can have identities, "themes" and policies as they wish. On Nostr it's totally fine for one relay to only allow certain kinds of content and block everything else. Users can just connect to multiple relays if they want to read/write about different things.