Sounds like a perfect HN startup MVP. Split your operating cash among banks to keep under FDIC limits while presenting a convenient front end ui for payroll
The specific problem for SVB was that many VCs got their companies to agree not to do this, specifically to keep all the money in SVB.
What was in it for the VCs???
I work for a six-person startup; our CEO landed on Brex after SVB, and one of the reasons he gave was that it does exactly this (up to 9 banks). See https://www.brex.com/product/business-account