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?
Venezuela means nothing to cryptocurrency world. It is the republic with extremely low standards of living, constant revolutions and frustrated population which is frequently unable to buy a slice of bread.
I wonder why they need those cryptocurrencies if they still have problems with the fiat money and their economics in general? There are not as many rich people as in other countries, so I wouldn't expect Venezuela to be a serious player on the market.