Normal CAPTCHAs just protect you from Spam, and already some of the easier ones can be read by Bots or are breakable without even using OCR technology, so they aren’t protect you any more. Daily, Internet user solve 60 million CAPTCHAs which sum up to a total time consume of 150 thousand hours a day.
And as a current trend within the Internet to share work to get it done faster, it just was a question of time when someone invents a CAPTCHA which not only protects you from Spam, it also uses this time useful.

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