I know people out there who have invested a lot in gold under the belief that in the event of like complete societal collapse or hyperinflation, they could use it for purchasing.
I have the hunch it’s a scam, but I haven’t learned enough monetary theory, business, or economics to understand why.


Because it was found by people in society. It was given value within an established society. I’m not saying no one will value it. I’m saying that until there is an established society, it won’t hold value. Then if you do end up in a society, you need to sway them to adopt gold as a currency while keeping your gold stores secret.
I disagree. look at the failed states right now. USD and precious metals are the most valued means of trade.