whereas an exchange shouldn't have a position at all
and a hedge fund normally doesn't allow withdrawals at all (without vast notice)
>> As of December 31, 2022, Silicon Valley Bank had approximately $209.0 billion in total assets and about $175.4 billion in total deposits.
Two things got SVB down. First, a rapid change in interest rate got their assets repriced down. It did not need to be fatal, this happens to all banks when interest rates rise quickly.
Second, its customers did a ran and went to pull their money. If all depositors of the BoA or Chase pull money out, those banks will collapse, too. This is highly unlikely for the BoA -- if folks start saying that BoA will collapse most depositors would shrug it off; the diversity of its base will make a run highly unlikely.
But as SVB was a much smaller bank and had a lot of similar customers (startups advised by similar VCs) the ran was seen as plausible at which point it was over -- customers pulled enough money to kill the bank. This is the price we pay for the flexibility of the current banking system that allows people to get loans and free checking accounts. My 2c.
The only job for these execs was to know which way the wind is blowing and they showed themselves to be not much better than every other rabid fool that bought GME etc. thinking things would never change and bull runs and low rates would last forever.
Not as extreme maybe, and less fraud got us here, but $assets < $deposits