National governments have banned bitcoins because they have not found a way to collect taxes! Bitcoin and altcoin are more risky in the growing phase!
I agree but that was the negative part of the government why they disagree.On the other hand, they might disagree disagree because the government can't monitor the transactions, how and what does users consumes using crypto. There's a high possibility that illegal transaction is being processed via internet and it's the responsibility of the government to take control of the people who are taking advantage to do bad.