Proof of reserves in itself is not proof of very much if the exchange has undisclosed liabilities and costs, which may supersede the claims of depositors in case of insolvency/bankruptcy.
I imagine if they just said we had 8% of our reserves in SVB, now we have none.
It would probably be interpreted as they didn't lose money and no body would notice.
Reserves are but one tool in the arsenal and it's also for tightly managing the maximum leverage. If all your assets are not cash-equivalent and they fluctuate in value then there is no maximum leverage that can be guaranteed a priori and there is operational risk.
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