The Facebook Inc-backed digital currency project Diem on Monday announced the winding down and US$182 million sale of its technology, capping a years-long initiative that drew significant concern from regulators. Facebook’s announcement in 2019 of plans to design a cryptocurrency and payment system raised immediate red flags for global finance officials, who expressed a barrage of criticism about the security and reliability of a private network. Diem Networks’ US CEO Stuart Levey said in a statement that the initiative made progress, but “it nevertheless became clear from our dialogue w...