They aren’t looking at your answer specifically to tell if you’re a robot. They’re looking at the speed of your mouse, and where you move it.
A machine moves their cursor in a way that no normal person would. So, they record the speed, and direction, to make sure your mouse isn’t teleporting across the screen.
Fun fact tho, these tests are actually why machines are so good at recognizing pictures in the first place! They record your CAPTCHA answers and use them as test answers for machine learning.
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