The Venezuelan government launches Petro in order to improve the economic situation that the country is going through. But it has not been successful due to many factors including lack of trust. Merchants have not joined President Maduro's call for adoption.
The price of Petro is at $ 60. In the authorized exchange plataforms for its commercialization, users say that its price is below between 30 and 40%.
I guess it's about people not trusting a centralized power rather than the trustless feature of real cryptocurrency.
In my opinion, a cryptocurrency could work well anywhere if it's built on basic crypto principles like transparency, immutablity, censorship resistant, trustless/permissionless transaction, privacy/anonymity, deflationary currency(& stablecoin)... plus things like security, usefulness, etc. There may be serious problems in future if you don't prioritize on those principles
Petro is handled the same way they handle the bolivar, you know, its currently the fiat with the world's worst inflation...
As typical of the old real socialism mindset, the usage of Petro is being "commanded". Executive decree for things to be calculated in petro, decree for public administration to accept petro (tho most still won't). Due to the lack of the aforementioned features, absolute centralization, people don't want it. The only way you can handle petros, is by using the gov assigned online wallet. They made an app, but that connects to the same place.
The current iteration of petro (after forsaking the Nem one) is a modified copy of Dash without any release of software so that the gov runs the only nodes and can change the rules on a whim (like they do to the fiat). This is of course, not exactly reliable...
With this precedent i don't trust any government issued cryptocoin. The whole point of Bitcoin is to get the Gov/State OUT from manipulating the rules for your money, to remove them the POWER to make EVERYONE POOR overnight (like they did to us in Venezuela).
Of course there is a parallel (much lower price) market, whenever you establish an "official" price, the pesky independent market (all those "brainwashed" buyers and sellers) will have theirs. The problem is not the market, the problem is trying to fixate (peg) the price by decree. This was how the bolivar was killed in the first place, they made the exact same mistake. Of course they don't care; they are above criticism, the rule of law, and all those pesky "imperialist" customs of freedom of choice.