Many governments banned bitcoin for the following reasons:

- They have not managed bitcoin, so they are worried that they will be losing revenue from bitcoin
- they are afraid that their citizens are cheated, lost in digital money transactions because many investors even if they have no ide of what they are dealing with
Picking the wrong time to buy and sell will cause them to go bankrupt causing the consequences for the national economy
For developed countries like Japan..., they are allowing crypto curency to use in public with taxation and big regulation system, this is the way to help the development  of the country
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