Cessnafly
I get the impression that until someone is killed from his actions, none of the authorities will step up, be it the CAA, FAA, ?AA, or one of the various countries police forces. It all sounded too complicated with a co-ordinated effort needed to define who could prosecute for what and where. This got further derailed when GEP was found out to be a convicted fraudster.
I suspect that he will eventually piss off the wrong customer, who has a short temper and a big wallet and his next flight would be in (the back of) an air ambulance, if he is lucky.