Government can control your bank accounts , when the war is going on they can do anything and tamper with it , but no one can tamper with cryptocurrencies, simple reason:- because they can't .
They don't hold the key to it , they are not in control of it.

During war it is extremely important to have someone to help you out with that time , financial things are bound to fall , Bitcoin on the other hand is something that is related globally thus it would still flourish and you can still make some profit even if the situation at home is bad.