Seems like they want to try to legitimize their centralized cryptocurrency so that they can attract overseas investors (very unlikely to happen, but you never know since there's a lot of idiots in the world), but I wonder who's going to be dumb enough to trade Bitcoin or Ethereum (to name a few cryptos) for Petro or even invest in a scamcoin like Petro? and if the corrupt and incompetent "goverment" of Maduro approved those exchanges then I bet they're going to be controlled by govt officials, meaning that those exchanges have a high chance of being absolute mediocre in terms of tech, security and efficiency, so it would be highly dangerous to conduct any type of business in these platforms.
What implications can this step have on Venezuelan economy being the economy with highest inflation rate and simultaneously what does this mean to cryptocurrency world wide?
It won't have any major effect in their economy since the money [from the Petro cryptocurrency] will go into the pockets of the leaders of the regime like Nicolas Maduro & co. and not the country. Also, a cryptocurrency can't be the saviour of such economic collapse like the one Venezuela is experiencing today.
What does it mean to the cryptoworld? absolutely nothing.