Money only works because we all agree to believe in it.
The book Money by Jacob Goldstein is the best thing I have read on this. It covers the useful fiction that is money and how it has has shaped societies.
From the inception of coins in ancient Greece, the first stock market to current day cryptocurrencies. When people first came up with coins and paper money, don't you think people questioned their value?
"At the heart of the story are the fringe thinkers and world leaders who reimagined money. Kublai Khan, the Mongol emperor, created paper money backed by nothing, centuries before it appeared in the west. John Law, a professional gambler and convicted murderer, brought modern money to France (and destroyed the country's economy). The cypherpunks, a group of radical libertarian computer programmers, paved the way for bitcoin.
One thing they all realized: what counts as money (and what doesn't) is the result of choices we make, and those choices have a profound effect on who gets more stuff and who gets less, who gets to take risks when times are good, and who gets screwed when things go bad."
For the record I am in on crypto including Dogecoin, just as I am in on FAANG, just as I am in on index funds, just as I am in on property. I honestly people not diversifying would be hubris.