I’ve been dealing with him all day. The problem is that you only notice the ReplyGuy (who is fairly harmless), while he has a bot partner that writes random texts in different languages, and then ReplyGuy responds to him. Without increasing the load on the server, it's not that easy to block.
Mandatory nip05 to talk is needed
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please don't reintroduce DNS as a requirement back into the network lol
oh wait it already is because relays use it
Can be used bag of words or TF-IDF, it’s not too resource-intensive, but it’s not a universal solution.