Rumors that Google is collecting data for a future humans versus robots event are unfounded. When you see a message from Google or encounter a page that requires you to respond to a CAPTCHA before you proceed, it's because Google is out to foil hacking and automated spamming programs, also called "bots." Unusual network activity, such as numerous messages from your computer, may trigger a Google message requiring you to prove you're human.
Bot Blocking
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Automated programs attempting to access websites usually come from spammers and are often called spam bots. The distortions in CAPTCHA, those boxes of text you have to solve to gain access, aim to defeat the text-recognition abilities of computers. If you can read the distorted text, you pass for human. In addition to blocking spam bots, Google gets your free labor through the Google ReCAPTCHA program which uses your deciphered words to to help create more content for Google Books. If you see repeated messages from Google about unusual traffic, you should check your computer for malware, according to Google.
