No it’s the CEOs job to hire people who know like a CFO and everyone else in finance. Lots of companies make short investments with extra cash. No need to put everything in a single bank account.
Why would we want a situation where everyone splits up their cash into $250k accounts? Seems like that would waste a lot of time while removing competition (who cares what the bank is, any bank is fine for $250k). And it wouldn't ultimately save taxpayers any money, it's just a strategy for gaming the current FDIC guarantee.
You don't need to limit your accounts to a maximum of $250k. You just need to use more than one bank if you're going to use a regional bank like SVB.
Especially a regional bank like SVB that fought hard against regulation, caters specifically to herd-thinking VCs and startups, offered 4.5% APY, and went all in on mortgage backed securities shortly before the Fed hiked rates way up.