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Can Greasy Fork add some Captcha to the reply posting when the reply contains a suspicious link?
Users need to pass a recaptcha to register accounts. So either it's a bot that can solve reaptchas, or it's a real person. In any case, I don't think tossing another recaptcha challenge is going to help.
There are processes that check comments after they're posted, and they're especially strict on new accounts. But some stuff still make it through. I have a statistics dashboard and have been making changes to improve the process.

https://greatest.deepsurf.us/en/scripts/431573-youtube-cpu-tamer-by-animationframe/discussions/314982
Obviously these AI bots use LLM to generate something then put a suspicious link to that. So it should be very easy to detect since the link is not mentioned in anywhere in GreasyFork and the link is something like "https://xxxxx.io"
Especially these are the new accounts for their first reply.