Then they fight you.
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U.S. FDIC tells Signature Bank's crypto clients to close accounts by April 5: https://www.reuters.com/markets/us/us-fdic-tells-signature-banks-crypto-clients-close-accounts-by-april-5-2023-03-28/
Then they fight you.
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This only lead to more distribution of bitcoin banking as customers seek alternatives. Its a win.