there may be several factors that make many countries in Asia not yet support bitcoin as a legitimate medium of exchange

the first factor is probably the state is protecting the value of their currency because it is feared that a lot of money will be spent in the country to buy bitcoin, make it weaken the country, or trade factors which is still traditional and buying and selling still uses paper currency so it is still difficult to accept digital currency, or the three government banking technologies may not support cryptocurrencies, so the government does not want to take a lot of risk.