I don't log IPs on my relays, but shit like this almost makes me want to, just to see if it's coming from the same IP address.
Discussion
I log IP on grain. It will be banned on my relay soon if a solution is not found. I will make it known when I do. Still only a temporary measure as that can be changed with a VPN fairly quickly
Right its only more whack-a-mole.
For half a second I was thinking that auth on relays would fix this, but I don't think that would fix it either. Even if it was free to authenticate on a relay, whoever is writing with spam bots can just have the new profile authenticate before making a new npub making that pointless.