Thinking about a noteguard filter that broadcasts nostr notes of the IP address of bots that spam my relay. Then other public relays could read that note and add it to their block list automatically (...
That sounds more reasonable from a privacy point of view, only broadcasting IP addresses with some reasonable suspicion.
Relays can use that info directly, but clients could also tell their relay to filter from a given IP address (though that's a bit dangerous as an attacker could use it to confirm that an IP address is used by some npub).
Relays can use that info directly, but clients could also tell their relay to filter from a given IP address (though that's a bit dangerous as an attacker could use it to confirm that an IP address is used by some npub).