The govt will never allow a currency that they have no control over.
"The govt"?
Which government is "the" government? Which jurisdiction?
I live in the USA so I'm referring the US federal govt. The only one that has the authority to issue currency in the US.
Besides the point that the US accounts for only 4% of the global population and assuming "the govt" will be interpreted as "the US govt" is silly, there is also the issue that the US government has delegated its currency issuance authority the the Federal Reserve, which is a privately owned bank.