The article talks about crowd processing eliminating falsified balances, but it doesn't go into some exchanges getting hacked. Hasn't that been a security conce

The article talks about crowd processing eliminating falsified balances, but it doesn't go into some exchanges getting hacked. Hasn't that been a security concern? Haven't people lost money that way? I know my credit card numbers can get stolen, is that the right comparison? Do exchanges just make you whole?