Do you think governments are afraid legalizing bitcoin because it's difficult regulating its use, circulation, determining individual's worth, earnings and may lead to tax evasion?
I think for countries that have not legalized bitcoin, it is because the government is still considering many risks that will be experienced by the state, such as those used for the transaction of illicit goods, and firearms.
or the use of bitcoin for negative things, such as gambling.
and many other things, why the government still forbids it.