Although, think about it for a while. In a world war, the last thing someone has is access to the internet. Would bitcoins lose their value?
War if it occurs in all sectors is bad including Bitcoin / crypto etc.
But the opposite may also happen, if there is a war obviously people will be looking for a thing that can retain the value of their money it's either gold or silver, I'm sure real estate assets will just be a dust after a world war so that would be a not so good idea. And here is the bitcoin, I'm not saying that people are going to demand for it but who knows, bitcoin is already recognized as a new asset class.
War is the worst thing experienced by all humans, both civilians and opponents of war, the most severe effect is that destruction occurs everywhere, starting from the internet, electricity, and also food.
I don't think that the world is ready for war, if it happens in like 3 to 5 years, we are all fucked.
So, if the internet is down and the electricity is also down, automatically it cannot be used because the effects of war are certain Bitcoin / crypto cannot be accessed by people and cannot be traded, means: all will be destroyed.
That could be, but the thing is people won't be using bitcoin when they buy something, let's assume there is a war if you are going to store your money elsewhere, where are you going to place it, Banks? Gold? Silver? hmmm bitcoin?