~snip
how do they compensate traders if a case occurs as mentioned? Will they replace with certain claims or traders also have to pay for insurance polish for their investment?
Personally, such case will up to the owner exchange's policy. But a compensation for traders will be a good option without any extra fees because it should be the user's rights and the exchange's faults. Nevertheless, compensation for hack case should indirectly make the identity verification become stricter for the sake of 'security' and others such things for the exchanges.