A stock represents the ownership of a fraction of a corporation, let’s say that makes beanie babies. By owning said stock, you are entitled to that same corporations profits and assets from making beanie babies. If they sell more, you get more. If they sell less, you get less.
Crypto denotes a unit of currency. It doesn’t represent anything of real use or utility other than that unit of currency. Unlike the dollar or the pound that are backed by the full faith and trust of the government that issued the currency, Cyrpto is backed by nothing. It is decentralized. That makes Crypto not a good medium of exchange, unit of account, or store of value because the whole point of fiat currency is stability. Crypto is not stable.
For example, if you and your friends collected hundred of beanie babies. You all loved beanie babies so much, you just decided to pay each other in beanie babies for good and services. Let’s say you’re a pretty sweet deck builder, so you build your friend John a deck for 85 beanie babies. Now between your friends, that’s awesome. But there’s only so many beanie babies, and there isn’t anyone to guarantee a certain amount of beanie babies for your group of friend. So if your collection gets wiped out, that could makes the other beanie babies more valuable. Of if someone lost their the keys to their lockbox that contained thousands of beanie babies. Same issue. Wild swings of beanie baby supplies means you don’t know what to charge the next guy for the new deck. John doesn’t know what to charge for the hamburger he makes. With increased uncertainty, it means less exchange of goods and services, which means less GDP, which means you little Johnny won’t be getting that GI Joe with the Kung Fu grip.