Because corporate financial education isn't part of the YC curriculum and most small companies don't have CFOs.
Large companies and smart individuals keep cash reserves in pass-thru depository products like CDARS which do exactly what you describe. You have a virtual account at Bank A that shows your balance, but the actual money is stored across hundreds or thousands of other banks across the US - each holding less than the FDIC insurance maximum.
Large companies and smart individuals keep cash reserves in pass-thru depository products like CDARS which do exactly what you describe. You have a virtual account at Bank A that shows your balance, but the actual money is stored across hundreds or thousands of other banks across the US - each holding less than the FDIC insurance maximum.