Being a "gullible idiot" has made some people extremely wealthy, for next to no investment.
Your attitude is that of a dinosaur mate, sorry.
There are idiots in the space, and conmen trying to sell crap, but crypto is a legitimate asset class at this point and it's reflected in the market cap now, which is absolutely enormous and growing all the time. It's a volatile space, but it's still in its infancy.
Someone bought two pizzas with 10000 Bitcoin in the early years, to demonstrate its use as a currency. Bitcoin he acquired for next to nothing.
Those Bitcoin he parted with would be worth about half a billion dollars today. Or 250 million dollars a pizza.
The banks are piling into crypto now and while I wouldn't put all my life savings into it, it's still a speculators paradise, it's increasingly a hedge against inflation now and a legitimate long-term holding for cash.
If you want to speculate to try and get rich quick on obscure "coins", you're likely to lose a lot of money. But you can invest sensibly, I don't think there's a hedge fund or bank that doesn't have a small position in crypto now. I was a sceptic for a while, so I understand the perspective, but you're simply naive at this point if you ignore it all now.
Ignoring crypto at this point is equivalent to those who thought the combustion engine wouldn't catch on.