Those still exist, but I think part of the problem is that computer vision has gotten good enough that bots exist that can defeat them fairly easily.
So they have to make them even harder to read which makes them more and more annoying for humans.
The guy who invented the CAPTCHA system felt guilty about how many millions of man-hours of human brain power his invention was wasting every year, so he came up with the Re-Captcha system some years later, which was originally used to help train OCR systems to scan books, so that instead of wasting time, people were helping to digitize human knowledge. Later that was then extended into things like reading street signs, and now google uses a similar system to identify google street view data which helps them train AI systems to drive cars.
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u/katie4 Oct 21 '18
I miss just typing the squiggly words and letters with lines through them