Hello. I was expecting the national banks of each county to intervine and stop the rise of bitcoin. I don't understand the mechanism of this riseing. Only few words count a lot.
Who told you that they are not intervening?
Here in India, they are very close to banning cryptocurrency and making possession of Bitcoin a criminal offense which can be punished by up to 10 years in jail. Other less authoritarian nations are not introducing that sort of draconian laws, but even in these countries the governments are worried about the rise of cryptocurrency. But in most cases, they are intelligent enough to understand that Bitcoin is something that can't be banned.
The main issue for governments is that in countries where the national currency is heavily manipulated, the people are likely to use Bitcoin as a store of value. And unlike other assets such as gold and diamonds, Bitcoins can be easily hidden and transferred from one location to another. If Bitcoins become popular, then the value of the national currencies can go down.