Its simple
As Reichminister Walther Funk pointed out in his 1940 paper wher he detaIed the EEc and he single currency, uts is essential to have only one currency to force complete european political union and the Federal Superstate. Consequently, no other currency can be allowed to undermine it. They will make Europe a cashless society, thus transforming the Euro into the digital currency of the Superstate. Nothing must stop the 4th Reich.