It’s a phenomenon that affects central banking, payment systems, banks and financial market infrastructure. By definition those activities become cross-border so a cross-border response is always preferable to a fragmented national one. In many jurisdictions there is a very high concern about money-laundering and terrorism financing.
What needs to be decided here as a superpriority has to do with the level of political responsibility rather than the level of individual agencies. Therefore the G20 where you also have the government side coming is a welcome forum.