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.
This really is a serious issue until now as most of the countries are yet not ready to accept bitcoins as a mean of regulation. Also there are some governments from various countries which are trying to shut down the crypto markets which is really affecting the growth of bitcoins. Once bitcoins are passed from such issues then there will be a huge growth in them as there will be no serious obstacle coming in between the growth of the cryptocurrencies. There are some petitions going on with most of the governments so thinking positively, we can expect a legalised future for cryptocurrencies in each major country.
Those countries are just scared of cryptocurrency because they see it as something that can take power away from them, most government gets their wealth from tax on citizens income, at least majority of their income which they use part for investment to make more money into their reserve, now that they cannot know exactly what a citizen that use cryptocurrency for business transaction makes, they will rather go against it completely, but sooner than later, they will have no choice than to legalese it because the benefit of cryptocurrency to their economy is more than the disadvantage of it.