> And fiat currency isn't purely about perception of value?
Of course not. I don't know the laws of the country you live in, but in the US, the dollar is always acceptable as the payment of a court judgement and for the payment of taxes. That's not perception of value, that's value.
All money is just IOUs, but getting an IOU from your landlord is different than getting an IOU from a stranger. You will have to pay your landlord in the future, or the landlord will send someone to physically throw you into the streets, and might be given license from the government to just take arbitrary possessions from you. An IOU from the landlord will automatically offset that.
When you get IOUs from entities you don't have a ongoing financial relationship with, you need buyers who either 1) have an ongoing relationship with or are willing and able to transact with that entity, or 2) trust that they can find someone who has a relationship with that entity who will buy the IOU.
1) is value, 2) is the perception of value. Crypto has 3), in which there is no entity issuing or accepting the currency against a real debt (such as taxes or legal liabilities, which if not paid result in men in uniform hitting you with sticks, chaining you up, and locking you in a room), and no place to dump the currency other than other speculators.
You can find people who believe in bitcoin, so bitcoin is liquid. But bitcoin support relies on a constant and enormous amount of marketing and lobbying, in the exact same way as "hawktwa." Crypto (thus far) only has value in that it can aid in criminal transactions (semi-privacy), and that enough wealthy people own it that they're now convincing weak governments to subsidize it. Dodging law enforcement and government handouts to the wealthy on one hand; maintaining preexisting legal obligations and paying taxes already owed on the other. Both fiat and crypto rely on government, but crypto is government subverting itself. Crypto only has value to the degree that governments allow or encourage lawbreaking and corruption. Crypto (as it is, not a hypothetically) is parasitic.
> Zimbabwean dollar isn't remotely like the Swiss frank
The Zim dollar is exactly like the Swiss franc, except it's harder to find people who pay Zim taxes and court judgements than people who pay Swiss taxes and court judgements. Just as hawktwa is exactly like bitcoin, except they lack the lobbyists, and the marketing is focused around a viral youtube clip. The big difference between the two classes is that you don't have to be convinced that government fiat is worth something, you know it is. The reach of crypto, outside of fraud and government graft (which is real value) is simply the reach of crypto marketing.
Moving your money into a non-local currency or store-of-value has a cost and its own risks.
If you trust an untrustable government, you lose when they betray you. If you don't trust a trustable government, you lose when you spend years and decades hedging against their betrayal and it never comes.
Just as not all crypto is equal, the Zimbabwean dollar isn't remotely like the Swiss frank, just as bitcoin isn't remotely like hawktua.