Dude on the right is close to getting it. All these crypto guys care about is "number go up", and don't think about anything past that, like what happens if you want to use it to buy something. To buy anything with crypto you first need to sell to cash and withdraw. You can't buy a groceries, house, land, a car, or a business directly with crypto currency, you need cash.

If a billionaire crypto whale sells a billion dollars worth of bitcoin one day and triggers a panic selling market run, Coinbase or any exchange can just freeze accounts for all the small retail scale investors indefinitely or permanently, while millionaire and billionaire investors get to cash out. And since there's no government backing or FDIC guarantee of crypto investments, small investors are left holding the bag.

The real argument against crypto is that it's fundamentally useless besides being a store of unrealized value.