I have a hard time believing this. I'm sure some of them have gone bankrupt, but this must be for reasons other than their investing. Has any big cryptocurrency actually lost all of it's value? Not that I know of. Therefore, even if they lost a lot of money, they shouldn't be bankrupt. They must have to do with their expenses. If they spend more than they make, no matter how much they make, they may eventually need to declare bankruptcy. The only other option I can think of would be hackers. If you get hacked, you could potentially loose all your cryptocurrency. In that case, I could see a person going bankrupt.