I understood in general how the original CAPTCHA works - you get presented two random words that have been obscured and when you enter them correctly the API sends back a positive result.
For reCAPTCHA v2, however, it's just a tick box. Can anyone explain why/how it's able to stop a "bot" automatically ticking it?
I think i read recently that its based on probability, it shows a tick box based on past behavior, and apparently give a complex option if it believes you might be a bot.
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