Imagine you were designing the bank from scratch having no knowledge of the current banking system. How would you do it? The most obvious thing would be if a customer deposits money, you would hold 100% of the money 1 to 1 exactly how they deposited it. Then the bank could make money by providing services to their customers.
If I had to bet, most people who have money in a bank today think this is how banks work.
But in reality, when a bank receives money, a bank will take some percentage of their customers deposits (90% or so), and then invest that money trying to make a return on it. This works as long as all customers don't try to withdraw their money at once.
But when enough customers... say 10% of the customers try to withdraw money from the bank at once, since 90% of the money was in other investments, the money isn't really there, and you get a bank run.
Silicon Valley Bank is not new, the whole reason we have FDIC insurance is to protect against bank runs. As long as this is the system we follow, we will continue to get bank runs.
I feel like the entire banking system is broken because "The money isn't actually there". There needs to be a better way then relying to the government to bail out banks who make bad investments. Either a bank should be backed 1 to 1, or there should be some other way to keep hold of your money.