I would love it if the Venezuelan government came up with a true, decentralized, well-executed cryptocurrency that worked for the people. But this is not it. This is just a scam to stay in power, and I mean that as a person who has watched them act for many, many years.
This is your personal opinion, because you don't like the government. Fair enough.
The myth of "decentralisation" is ok for independent entities. We've already seen private companies exploiting the "decentralised" myth: their stuff is totally centralised, which is even worse than a government as they're not even electable or changeable or accountable and they can fail anytime and keep the money. A government will only create "centralised" systems because they'll always be part of a political management, like any sovereign monetary system.
Petro is not a "scam". It is just a project you don't like. Great, don't buy it.
But it's here and I hope it'll be a success and will benefit the whole Venezuelan economy. We will see.