while bitcoin is fairly welcomed in many parts of the world, there are few countries which are wary of bitcoin because of its volatility, decentralized nature, perceived threat to the current monetary system, and link to illicit activities like drug dealing and money laundering. Some of these nations have outright banned the digital currency while others have tried to cut off any support from the banking and financial system essential for its trading and usage.
There are countries I know that has banned the btc are vietnam,iceland,bangladesh and india. Because they think btc is not a legitimate payment method.
Foreign exchange trading with btc is banned in those countries as the cryptocurrency is not compatible with the countries foreign exchange act.