Earlier quoted context omitted.
This isn't some sort of complex bid call option strategy. This is a checking account, and one choice out of many that founders make regularly. To my knowledge SVB was never required, and startups always had choice.
Requirements aren't the only way to steer someone to a product. Google pays Apple billions to be the default search engine on iOS. Nor does the lack of a requirement indemnify someone from responsibility.
Could be a selling point for alternative incubators in the future.
Perhaps being a part of YC puts you at greater risk from these events. Draw your own conclusion about the reason why.