Their countries , their laws. It really depends on your definition for not supported too . If we speak about banning then as far as I know I don't think there is a country that actually banned bitcoin , at least nothing official and If there is then Its related to the banking system with one way or another . If its about the lack of usability in ATMs , local shops then there are plenty of countries and It takes time as some countries have more priorities .
I strongly agree on your opinion that, their countries, laws. And it really depends on your definition are not supported too. If we speak about banning then as far as I know I don't think there is a country that actually banned bitcoin , at least nothing official and If there is then Its related to the banking system with one way or another. And adding also my opinion that, some countries even declare 6 months jail if her people use bitcoin, Is it fair? I mined few cryptos and have left mining. In addition, each country have their own policy maybe the government are concerned will many wiping the money or commonly known as money laundering and fair or not that's what we have to face because until now the existence of bitcoin is still not recognized. On the otherhand, Those countries fear that Bitcoin will make their economy to go down, Also several taxation problems have been their, as people prefer Bitcoin to escape taxes.