No idea what fiat is..
Fiat to me is the bridge between material and financial valuation. Fiat create value to our access. In other words, even bitcoin, gold, silver and other materials and mineral resources have their value in fiat.
it's true that the problem is that bitcoin, silver and gold if there is no fiat currency that cannot be converted into money, so fiat was created to access our finances
I think currently only a few countries can apply fiat to exchange bitcoins because there are still no clear regulations for exchanging bitcoins with fiat in certain countries which are still being restricted.