Simple enough, really. Dodger couldn't accept that his digital lady love was gone after the fire of the Crash, and so he cut a Faustian deal, working with every mega he could (which means all the AAAs, and some AAs, too) helping them up their matrix security in return for being able to freely dive through their databases. Their entire databases. It was the act of a man desperate to find the woman he loved, very romantic, really. However, there appears to be some evidence that not only has Dodger Emerged as a technomancer, but that Megaera is his Paragon now.