There is a difference between the centralized cryptocurrencies that are issued by governments, such as the Petro issued by the Venezuelan government, and the decentralized cryptocurrencies such as bitcoin which are not controlled by any single entity.

Governments obviously are interested in the centralized version, because it actually gives them more control. They are only using the blockchain for their own benefits whilst retaining all control that they have gotten.

In that case, it doesn't really make a difference whether governments choose to issue these cryptos or not. They are not relevant to the decentralized crypto market. Only thing though is that the general public will be misled into investing in these national cryptos instead of actual decentralized ones. IMO, they're not even worth looking at since they are simply fiat or government issued bonds in a different form.