I didn't know about this until reading things throughout this weekend (which is somewhat telling), but evidently there are a number of approaches that businesses use to avoid having essentially all of their money held as uninsured deposits in a single bank. Those approaches are the seatbelt that we seem to have largely chosen not to wear.
The normal retail banks are TERRIBLE. I did my startup using a retail bank to start (BofA), and it was an absolute nightmare.
I ended up at First Republic, and they’ve been great.