First, don't try to get real information from Youtube. The S/N ratio is inversely proportional to the viewability and entertainment value.
Second, if your going to try to understand a system you have to study the entire system. Point-of-fact is that classical economics starts to fail at the edges as soon as you get a operation bigger than a lemonade stand. When the system is large enough to print money, essentially outside the supply-demand structure, the materiality of the structure goes out the window. Money is not a commodity so bankruptcy is a useless concept. Think of it as a measure of confidence independent of materiality.
In this system there is no "gold", real metal or otherwise, to steal. It might be useful to think of a US dollar as being a betting slip. A slip that registers a bet that the US will remain a viable economic entity and that there will be something you might wish to buy in the US system.
If you have low confidence in the issuing national economic structure, and/or there is little reason to believe you will be doing business in a market that demands the currency it will have little value. The US dollar has a a lot of utility because many things, oil being the best known commodity, are priced in US dollars and there are hundreds of trillions in circulation in paper or virtual form. The mint can issue trillions in currency without changing the overall value because the issue is small in proportion to the overall quantity.
References to post-WWI Germany and Zimbabwe are useless because neither of those currencies were used to price anything important or used as the defacto reference currency. In effect the US dollar is the water all other currencies swim in. Don't confuse pricing with confidence. A British pound is worth more than a dollar but while the pound is important it is not the reference currency nor anywhere near as important as the US dollar.