It's a CV arms race - the CAPTCHAs are meant to stay ahead of state-of-the-art CV tech. That's the entire premise behind reCAPTCHA - if you've solved it, then we've sold useful real-world problems and can move onto the next ones.
That's the entire premise behind reCAPTCHA - if you've solved it, then we've sold useful real-world problems and can move onto the next ones.
The original premise of reCAPTCHA was to help crowdsource the digitization of books by providing spam bot prevention. It's slogan was "Stop Spam, Read Books." up until 2014.
