They should probably have some kind of clock system that physically disconnects their machines from the internet and only allows customers to log in at their prescribed time or by appointment if they want a transaction. Kind of like those fancy vaults.
Also, why would you want to store your bitcoins on an exchange? I assume you wanted to exchange them for real money, so... wouldn't the original owners of the bitcoins have gotten their money when they traded their coins in? Why wouldn't they just keep their coins stored locally if that wasn't the intention?
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