How does google use Captcha for self driving Cars

Question

Ive heard many times that google gathers data for their self driving cars through captchas.
But how does it train the AI if the AI already has the solution to the captcha im solving.
Its like a school test. The student can give right or wrong answers. No matter what answer the students gives, the teacher doesnt learn anything because he already has the answers

In the same way how does the „AI“ know my answer for the captcha is wrong
And how does my answer train anything

In: 8

Answer 1

It doesn’t have the solution, or rather it might have a part of the solution if it gives you multiple images. This was most apparent in the early captchas that gave different qualities of texts.

It gives the image to millions of captcha users to sift out bad advice and help select for obstacles, stop signs, street lights, etc.