I read that the captchas change because the purpose of a particular one was both to have you do something a computer couldn’t (yet) AND to train models so that they could.
When they wanted you to pick the boxes with numbers in them, it was to help Google identify what was a house number. Useful for robot axis to identify that they are in front of the right house or connecting street view data to maps.
Which pictures have stop signs in them or busses or bikes? Useful for automated driving.
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