Same is true even of gold. You can't eat gold. You can't shoot gold. Save from tiny amounts used in electronics manufacturing (and good luck with that in your shack after the apocalypse), it has no practical use.

It only has value because people agree it does, just like money and Bitcoin. It's better than money because it's harder to "print" (mining gold is basically the same thing as printing money - increasing the supply thus decreasing the value - but at least it actually takes effort), but apart from that it's basically the same thing.

If things go to shit, you want food, fuel, weapons and ammo.