There are a lot of reasons why a lot of countries do not allow or discourage there people to use crypt in thier country but for me the most reason or the common reason is that they cannot control or they don't have the power to regulate it. There are also some countries that has the reason of this kind of thing the crypt currencies can be used for illegal trade or transactions that is why they don't allow it to thier land. We are just luck enough here in our country because this is somehow accpeted by the government and hopefully they will accept this a whole.