It uses adf.ly currently as this is the easiest way for developers to earn from their game plays. It's kind of like view an ad to play, no different to kongregates view a video before playing. I want to move into a better direction eventually but currently ad networks don't tend to allow you to place ad's on third party sites and usually moderate the use of your ad's. The main option will be to create a network specifically, that can't happen overnight unfortunately so at the moment adf.ly is the best way for developers to earn.
I'll be adding more of my games to the site soon. Again this is an alpha version and hopefully the site will grow as developers earn a better rate for their games.