I think because bitcoins can not be controled by government and it can kill fiat money, if all of people on countries use bitcoins for payment method in their real life, the fiat money will be useless and it is mean the government can not become regulator and can not take taxes.
yeah potential in bitcoin might make fiat become irreplaceable. perhaps it is thought by governments which do banned, they think that bitcoin is growing very fast in their country and it threatened them
Actually Bitcoin Acceptance depends on proper education
In the current era of disruptive technology, the creation and development of a number of cryptocurrencies has seen, has a great interest in the direction of the latest series of nations, governments and corporations.
The majority of users do appreciate cryptocurrencies and apply the features as a flexible means of liquidity. Some other features such as privacy, have ease of transfer and potential to increase in value capable of accepting Cryptos.
"The countries that banning usage of bitcoins need to understand that Bitcoin is new technology."