As I understand things, the problem at SVB was that they had customer deposits tied up in multi-year treasury notes which are among the most secure investments

As I understand things, the problem at SVB was that they had customer deposits tied up in multi-year treasury notes which are among the most secure investments going but they couldn't withdraw the money fast enough to keep up with customers' instant-access accounts. Having your money be secure but inaccessible for several months is obviously a problem if you're a business that needs to make payroll, or a crypto exchange that needs to allow customer withdrawals. If the bank has plenty of cash but some of it's time-locked, then JPMorgan aren't at risk of losing their entire $5bn - they merely risk having it tied up for a year or two, perhaps getting an uncompetitive interest rate.