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Exactly, as we see from the history of fiat currency, where acceptance for taxes was initially a monopoly given only to the fiat currency.

Cash is just the physical representation of a fiat currency. Fiat currencies exist independently of cash.

As long as you can pay your taxes somehow with cash, I fail to see the problem? The tax office doesn't need to accept cash directly. I don't really see the problem if they delegate handling cash to banks or other institutions as long as no one can be denied access to those.

rather, denying the basic concept of fiat currency