Of course my examples are a bit tongue in cheek, much more nuanced and not as "Bank bad" as I paint them to be. But It's entirely possible for a bank run/economic downturn to wipe out a currency overnight.
Does that mean crypto is the solution? It sure doesn't seem to be given cases like this (NFT/ETH being rugpulled from/by videogame devs). But I think that creating "better banks" can only mean "more government oversight", which leads right back to the original problem IE; economic/political factors having too much control.
I of course keep all my money in the form of expired New Hampshire State Highway toll tokens.