eli5: How do Captcha’s know the correct answer to things and beyond verification what are their purpose?

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I have heard that they are used to train AI and self driving cars and what not, but if thats the case how do they know the right answers to things. IF they need to train AI to know what a traffic light is, how do they know im actually selecting traffic lights? and could we just collectively agree to only select the top right square over and over and would their systems eventually start to believe it that this was the right answer? Sorry this is a lot of questions

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Anonymous 0 Comments

Recently I had one where it asked to identify all the “cabs”. 2-3 of the images clearly had a cab, which i selected. One image had a yellow car that was not a cab. The captcha continued to fail until i selected the yellow car as well, even though it was clearly not a cab.
I felt much worse about it than I probably should have, in providing wrong information.

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