If world war happens, crypto will collapse because internet will be badly affected, there is only war between 1 or 2 countries then the fiat pouring into crypto will be huge.
I don't think the scenario would be like that because the internet is not controlled by one person...
the world war that is likely to occur in the future will not make the entire world go to war, only a few will war. and maybe the Bitcoin price will go up instead of down because it's been confirmed that there will be many who secure their assets, Who knows.
The first thing come to their mind is destruction when they hear or read about world war. So they ended up of having a conclusion of internet desctruction. It is true that when world war occurs, only few countries will join and some will just take advantage of the current scenario. Value of bitcoin is very unpredictable but it increases when some unusual happens in the world.