>Why do we sometimes get multiple captchas (sometimes even “infinite” to the point where you simply quit) and other times only one?
A CAPTCHA-system will commonly keep serving you puzzles until it is sure – to a certain degree – that you are not sending automated requests.
You can employ CAPTCHA-systems for other things as well. Want to discourage people from leaving hateful troll comments without having to receive accusations of censorship? Hit them with a CAPTCHA every time your neural net determines their comment to be non-constructive.
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