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Would you be able to say how your company accomplishes that?

Honestly, statistics from about 2010 (ie before the age of neural network hype) and limited human observation.

Human moderation and ad-hoc heuristics seems to make the difference at Reddit too, rather than the CAPTCHA at registration.

In practice it is a major pain to keep up to date, and bots slip through all the time, at least on the subreddit I help moderate. It's a lot of manual volunteer work.

I get a recaptcha when trying to sign up for a new account:

https://i.judge.sh/Flutter/45DyMRuL.png

maybe this is related to some other heuristic they're using for determining whether or not to show recaptcha (although this is in a no-extension Chrome on a residential IP address).

Right, they have that at registration but it's either superfluous or it only catches the really easy stuff because they rely on an army of human moderators who spend all day cleaning up after bad actors able to click buses.

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