If I bought some Bitcoin for $1,000 and it gets up to $18,000 and it crashes to zero, I’ve lost $1,000. Just like the secretary at Enron who put $60,000 into Enron stock. One day it was worth a million bucks then worth zero the next day and she’s on TV claiming she lost a million dollars.
There is a thing called “Stop Loss” that prevents that type of loss. You just have to mark where you want to sell.
I see this getting to 100K before any type of major correction.