that link was submitted by an alpha tester. he submitted one of the picture/question challenges, and in exchange, he gets rewarded impressions of his link.
I think you missed his/her point though. Captchas should prevent spam, allowing a user to include an arbitrary link that will appear on any random site is not much of an improvement to the site owner.
Yeah, but this problem already exists on WordPress comments for example. People are free to add whatever link they want with their comments. I don't think a Glen Beck link is spam, (though I do personally think he's a gimmick).