All central banks have the right to warn the public about the use of any currency. Regarding the uncertain and unsafe nature of cryptocurrencies, this happens due to the uncontrolled nature of decreasing and increasing price of it. Any bank will hardly agree with the unstable price of crytocurrency. We are unafraid of the banks because we have our own handling of our investment and safekeeping of it without the use of any bank. The banks will begin to be afraid if majority of people are already in cryptocurrency and are not using fiat currency.