Courts of law should decide if your money is legal or not. Not private entities such as banks. This is actually a case for cryptocurrencies and central bank digital currencies.
Ciro Santilli had a fun mini-case of this with his Barclays account frozen for a few days in 2024 in the UK after receiving a large anonymous cryptocurrency donatio: Barclays regulation.
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De-banking refers to the process through which individuals or businesses are removed from banking services or denied access to banking facilities. This can happen for various reasons, including concerns over compliance with financial regulations, fraudulent activities, or risks perceived by the bank. The phenomenon has gained attention in recent years, particularly in relation to groups or individuals whose activities or affiliations may be deemed controversial or risky by financial institutions.