The collapsed payment processing company Greymountain has had its share of controversy. First, the Irish firm was the subject of a thwarted class action for millions in damages brought by average Joe investors across the globe from Abu Dhabi to Florida who claimed they were defrauded out of their savings. Then last May, its owner David Cartu was sanctioned by the Ontario Securities Commission in Canada for unregistered binary options trading involving Greymountain and another company UKTVM that resulted in investor losses, and violated securities rules. Now the liquidator of Greymountain is pursuing Cartu, a resident of Israel, and his…