So-called "prepaid crypto vouchers" or debit cards are denominated I fiat. The money you buy them you've sold your Bitcoin for fiat and then we're back to square 1.

Grrr autocorrect. Again: So-called "prepaid crypto vouchers" or debit cards are denominated in fiat. The moment you buy them you've sold your Bitcoin for fiat and then we're back to square 1.