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Surely by being a bank, you are already exposed to that.

Exposed yes, but not fatally if you're working with alternative de-dollarised banking systems in the eurozone, for example.

Won't help if they sanction you and cut you off from SWIFT (or the card networks) so it just depends on the degree of the governance issues here.

Most european banking entities already have and use SEPA.

Any alternative non US, Europe wide card network? I suppose you could use Mir, or UnionPay.

This is an issue, but one Europe is acutely aware of and working on. WERO is one strand of that.

Ah.. SWIFT is an international cooperative, originated in Europe and based in Brussels..

Monzo are a UK bank that briefly but afaik no longer operate in the US

They are partially Chinese owned, so you can imagine Trump having a fit could be ordering AWS and GCP to stop servicing this bank.