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I haven't said cash == tax evasion.
I said "cash has been the driver of tax evasion (...) like forever", so deriving one from another is a syllogistic fallacy.
Because cash has been the instrument of tax evasion, countries have long ago imposed KYC (know your client) and other AML (anti-money laundering) measures on financial institutions that include limitations on traveling with or paying with large sums in cash.