Proof of reserve reports are inherently limited, and customers should exercise extreme caution when relying on them to conclude that there are sufficient assets to meet customer liabilities."
That sums it up as simply as possible.
I can show you now I have $100 in my wallet. If I owe $10000 that $100 is entirely meaningless.
I can TELL you I only owe $50, but without a real audit / accounting it's just what I am telling you.
<cough> FTX </cough>
Some places like Coinbase are a little better in the fact that since they publicly traded businesses they do have certain reports and audits that have to be done a certain way.
BUT, we also know that those things can also be 100% meaningless <cough> Enron </cough>
Wait for it......
NOT YOUR KEYS, NOT YOUR COINS.
-Dave