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Are captchas enough to stop bots?
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To expand on what others here have said: no they can't, and there was a recent article here on Lenny taking about how AI (which I know is different from average bots) has figured out most of the visual captcha types.
Funny you'd mention Lenny, he's also a bot! A good one though!
https://en.wikipedia.org/wiki/Lenny_(bot)
https://www.lennytroll.com/
https://www.youtube.com/watch?v=XSoOrlh5i1k