Many cryptocurrencies cannot be "banned" that was the point of many, to decouple control of monetary systems from extra-governmental entities. Some are totally a ponzi scheme, but fiat money is not "real" either. It's fancy paper, value is what you believe it to be in either.
In a catastrophic situation or civil war, only real objects will have value.
Nope. A single country going down isn't going to take out a major cryptocurrency. Half the countries in the world going down won't take them out. Plus, people have backups that don't need electricity to boot back up later.
That's not an argument against cryptocurrency really. Theoretically in a situation described, you could retrieve your bitcoin after the fact, something you couldn't do with your fiat cash if your nation lost.
Blockchain tech holds the key to a monetary system far superior to fiat, hands down, no questions asked.
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