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Full Version: I'm Not a Robot
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“Some reCAPTCHA tests simply prompt the user to check a box next to the statement, "I'm not a robot." However, the test is not the actual action of clicking the checkbox – it's everything leading up to the checkbox click.

This reCAPTCHA test takes into account the movement of the user's cursor as it approaches the checkbox. Even the most direct motion by a human has some amount of randomness on the microscopic level: tiny unconscious movements that bots can't easily mimic. If the cursor's movement contains some of this unpredictability, then the test decides that the user is probably legitimate. The reCAPTCHA also may assess the cookies stored by the browser on a user device and the device's history in order to tell if the user is likely to be a bot.”

https://www.cloudflare.com/learning/bots...chas-work/