It is looking at the feedback. On a PC it checks how you move the mouse and on mobile it checks your time for checking I’m not a robot.
And compare that since the last time you had to do it.
The value of this is questionable. Most websites do it to show to Google that they are sincere. Having any form of ‘captcha’ is less annoying than all the low score and complaints you get if you don’t.
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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