Maybe it's as simple as Griffith looking to make a name for himself and jumpstart a criminal enterprise that he knew would inherently involve doing blackmarket deals with bad actors. He certainly knew who he was helping out, re North Korea. Having the North Korean effort on your new criminal resume would be a large resume booster. It also explains why he would be looking to leave the US, where he'd be guaranteed to get nailed by the feds for anything in that arena eventually (and sooner than later). There has certainly been enough of that action in the crypto era and money is a prime motivator for most people.