[SideburnsOfDoom]

> Many individual countries already have their payment systems, and have had for a long while.

Yes, but also Single Euro Payments Area (SEPA) is a thing already (1). SEPA instant has been live in some places since 2017 (2).

1) https://www.ecb.europa.eu/paym/retail/sepa/html/index.en.htm...

2) https://en.wikipedia.org/wiki/Single_Euro_Payments_Area#SEPA...