With US bombing Iran, talks of WW3 seems closer and closer. I am, of course, not wishing for this to happen as nothing good will come out of it. But let us think for a second how will bitcoin be useful to us should WW3 actually happen? First of all, expect chaos. Fiat Currencies would most likely decline. Governments would need to print more money to budget for fighting other countries. This will surely lead to inflation. This is where crypto would come in handy. Bitcoin can be a safe haven for most.
The most important thing is if you live in a country directly affected by the war, surely people would migrate and seek shelter. Bitcoins can be helpful for doing this as you will not be carrying your country's local currency. I am sure now that people would be buying crypto in fear of the war happening.
I would say here that first of all, we need to keep in mind that it is a reality that we cannot recover all the losses in the world. For example, during the dinosaur era, a single meteorite wiped out all the dinosaurs and hundreds of other species of animals from the earth. If World War III or such an event were to happen again, I don't think there would be any Internet, and no Internet means no Bitcoin.
And even then, if some parts of the world are affected by World War III, yes, it is true that Bitcoin can help us protect our assets the most. Still, I think it is very important to have a backup when such a situation comes, for example, it may not be a very good suggestion, but it may be applicable for that time to include all your private data in a file, encrypt the file and upload it to Google Drive in ZIP format, so that even if there is a war, if you only know the password to your Google account, you can recover all your funds.