Crypto is not as reliably anonymous as cash. Anything with a distributed ledger is pseudonymous so if one transaction can on your wallet can be linked to you, so can all other transactions, including historical ones, to that wallet.
I really don't think I need to explain the obvious difference between physical US dollar notes and USDT.
I'll point out that in most of the world a $100 note is only worth $100 if it's in basically mint condition, the value falls rapidly as condition degrades.
Even banks struggle with this https://meduza.io/en/feature/2025/05/30/old-money-new-proble...
Goes to show how viable cash is as a store of value for most of the world.
I have lived in, and briefly worked in a bank in, in a country where people do use USD, GBP etc. notes as a store of value, sometimes in large amounts (you hear about that when they get burgled!).
Anyway key point is your USD better be mint and at least 2018 or they will refuse it... Same at currency exchanges in most of south east Asia that have their own currency.