Protects Against Web Spam

It is typical for "SEO Marketing Companies" to take advantage of forums and blogs by creating worthless posts and comments with links to a website they are promoting.

If your web-property allows user-generated content, you are likely to use CAPTCHA. CAPTCHAs are not perfect:

They annoy your visitors.

They provide an illusory sense of security.

Today it is possible to buy access to an API which solves any CAPTCHA for just $0.70 per 1000 CAPTCHA images. And do you think your customer will be happy to try to solve one of these ridiculous CAPTCHAs?