I think Those country are afraid of their economic system and they think Blockchain system is getting a thread for their stock market. Day by day Blockchain system is becoming popular and powerful around the world so that some country's government are getting confused what they will do?
Not only that but also their main concern is to protect their people's money, they usually consider this blockchain system is not a secure system that's why those country are not choosing this platform. Whatever the case is, This blockchain system will sustain for a long time and it will be the most powerful financial chain in the future.