... A New York Times article from April claims that CAPTCHA reading sweat shops in India, Bangladesh and China have become popular with spammers and this is where the action is.

But the economics of such outsourcing depend on the workers being able to solve a certain minimum number of CAPTCHAs, NuCaptcha can mess with these economics by increasing the time of the video before it can be solved if the system detects signs of a CAPTCHA factory. All these settings are controllable by the site administrators. NuCaptcha is not alone in trying to defeat such systems, but if they really can increase the time to solve in such cases and not affect normal users too much with it, then they could make CAPTCHA factories unprofitable.

Read More:
http://blogs.pcmag.com/securitywatch/2010/06/video_captchas_could_ease_regi.php