"We're aren't sure customer's recorded balances are accurate and it may be possible for money to simply appear or disappear in our system, but we definitely have enough money to pay out everyone's balance (which as already mentioned is inaccurate)"
But lets see how this turns out.
To be honest, crypto doesn't even need exchanges. Some even have smart contract capability that can explicitly outline the terms and conditions of any single trade. An exchange is superfluous. So as soon as you see people going to an exchange en masse, to trade assets with smart contracts on them, you know something is out of place.