Just to clarify your misconceptions, Gates Unitta is the Asia wide joint venture between Gates Corporation and Nitta Corporation. They manufacture and supply genuine Gates parts, including 2GT belts and fittings. Gates LLC (US/Europe) no longer make 2GT belts or fittings.
So E3D source their, genuine, Gates 2GT belts and parts from Gates Unitta. Anyone wanting to supply Gates 2GT belts (eg. Prusa), will have to source them from Gates Unitta.
Welcome to the global economy.