The title is clickbaity. It's not like the banks are missing any of their depositors' money.
What you're saying is that the valuation of their assets at maturation (or at market for non-maturing assets) exceed their current liabilities which should be true across the board.
No large bank could pay out 50% of their deposits in a single day without becoming insolvent. And even if they could fully liquidate they couldn't all cover their liabilities at current market value.
It's also worth noting that if you read "banks" in the title to generally mean the banking system, that money is effectively missing as it now sits on the Fed's books and is no longer in the banking system at all. That's a start difference to standard repo markets where the total liquidity of the banking system doesn't change when securities are purchased.
it would be like if at the end of the day the parents came to pick up their kids and—on a good day—10% of them were available to be picked up
a more appropriate analogy would be if the school was handing out the kids to random people that very possibly wouldn’t give them back, or if they would, possibly not for at least a few years once they’ve grown up a bit
the whole concept of a modern bank is ridiculous and a lot of people need to seriously reset their thinking around it. if you want a high risk investment than you can put your money in a fund. high street banks should not be high risk investments, especially for the measly interest rates they give out
The concept of a "modern" bank (federally-insured fractional reserve banking) is 90 years old now. Its faults are well understood and, for all the drama, it isn't high-risk for ordinary depositors.