Putting money in a bank is a form of risk management. A startup can choose to:
* Buy expensive office equipment or put it in a bank
* Go on a hiring spree or put it in a bank
* Acquire another company or put it in a bank
* Put money in crypto or put it in a bank
Shopping for a bank might mitigate a bit more of your risk. Putting it inside of a bank is low risk compared to the many things you can do with money.
Hundreds of thousands of businesses store more than $250k in a bank and for most of them, the largest risk to their business is not their bank.