Use reCAPTCHA v3.

Also, post honeypots that only bots can see, and when they engave with them (which regular useds won't do as they won't see them) ban them.

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Discussion

IMHO, using recaptcha would be like using “Sign in with Google”.

Recaptcha would have to become a NIP since all of this happens over websockets and not basic HTTP. And then nostr clients would need to add support for recaptcha.