* If I many ask what is the major reason while some countries ruling class ban bitcoin transaction?
* What is the negative effects using crypto as currency?
* what harm does bitcoin contributes a country that can lead to ban?
Lose of control. One way of countries having control over their people is through the local currency. If Bitcoin ends up booming in that certain country, they lose a significant amount of control. The fact that they would most definitely take a hit in terms of taxes getting collected alone would heavily incentivize them to enforce a ban.
It is not so much about control as it is about sales taxes. Many countries do not have a method of accounting even when people want to do so.