Earlier quoted context omitted.
Your German example is a bit silly to use here given that its exchange rate is 1:1 with euros. There are other regional currencies in other countries, they don't usually operate independently from the country's own currency though.
How so? The Libra proposal kept its value constant with respect to a basket of currencies.
(This is one of the things that confuses me about Libra's target market; if you believe the cryptocurrency marketing about privacy and permissionlessness and inflation-hedging, then Libra is terrible at those things. If you don't, and you're in Europe, you just use SEPA.)