This is still a question nowadays because not all country gives a go signal for bitcoin. They are taking a lot of things just to slow down the growth of this currency. If not eliminate the whole system. What can you say guys.
Cryptocurrency aims to create a decentralized monetary system (Unbound, not monopolized by one party). Based on this, the purpose of cryptocurrency itself (if successful) replaces the role of banks in carrying out transactions and payments then the banking will lose customers, fee-based income, and sources of funds that they can take advantage of earlier, Maybe that's one reason why not all countries give go signals for bitcoin