> Fiat sometimes doesn’t protect you, but crypto NEVER does, and CAN’T, even in principle.

You're selling your old PC. The buyer pays you with Paypal or a check or some other digital fiat transfer, you give them possession of the PC, then they reverse the charge and steal your money.

That's the thing cryptocurrency protects you from, in the same way and for the same reason as cash does. And if the fiat system would provide that over the internet -- irreversible anonymous cash transfers -- then cryptocurrency would be a lot less useful. But it doesn't, so it's not.