Just because they have a lot of money doesn’t mean they have the expertise to evaluate a bank’s inner workings. Although I guess they could have hired people at considerable expense to do that … and I think some of them did which was what exasperated the run when they mass redrew their deposits. That or I think they can buy insurance … that said I wonder how many people/corporations actually buy insurance for their deposits above $250k.
Still my point stands, having depositors drown won’t stop others from pulling another SVB.