it was both

it used to be two screenshots of books, one of which was blurred as fuck, and one of which was usually pretty easy

the easy one was to verify that you were a human, and the blurry one was to train ai

now that they’ve moved on to “select all the fire hydrants” or whatever, you can still see a distinction between the ones the system knows and the ones the system doesn’t know, and if you get good enough at spotting it, you can pass the captcha while feeding it deliberately incorrect information

similarly, the audio test will normally be a short phrase, the first half of which is harder to understand; if you get the second part of it right, you can basically write whatever you want for the first part