alt Hacker NewsYou really missed the point. SVB was undone by their own failure to manage interest rate risk, and then by the actions of corporate depositors. Retail banking customers had little to do with it. Corporations certainly aren't going to participate in some sort of pointless consumer protest.
It's a liquidity problem. Retail absolutely can drop any given bank into a liquidity crunch by pulling out too many funds, too quickly. It doesn't even need to put a given bank at risk of insolvency, if the situation is read as widespread and/or growing, because as the event expands, so does the likelihood that someone else is mismanaging their books. Someone who is hooked into another institution, and another, and another. Contagion.
Anyway, corporate depositors have a duty to safeguard their capital. That means that if a bank run is underway by retail depositors, they're in line too, willing participants or not. This is why, again, even discussion of bank runs is discouraged, and their likelihood and effectiveness downplayed. They're built on turning the imperative of self-interest, which the financial industry is built on, on its head.