Every country's government has their right to implement any rules or regulation on the use of crypto currencies, as they have their reasons. If properly controlled, the use and legalization of crypto currencies will positively affect the economic nature of the country.
Recently, the government of my country restricted and placed a ban on the purchase of bitcoin and other crypto coins with the use of bank transactions, having it in mind that it will be used for illegal money transactions that cannot be traced or monitored.
Well, no matter how the country will want to place ban on the use of crypto currencies, it is only within their control, cause the use of P2P has made it more easier.