Can proof-of-reserves prevent future crypto exchange collapses?

A number of crypto exchanges are rushing to publish proof-of-reserves in a seeming attempt to reassure investors their funds are safe as fellow exchange FTX melts down.
Proof-of-reserves (PoR) are independent audits by third parties that aim to provide transparency and evidence that a custodian holds the assets it claims to own on behalf of its clients. Auditors then aggregate balances into something called a Merkle tree, which entails all client balances.
FTX exploded this week following a CoinDesk report that showed a June 30 balance sheet of its affiliate trading firm, Alameda Research, was

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