It is, and no prudent company should have lost their entire war chest unless their funding arrived just yesterday. But when you're spending $10M or $100M a year

It is, and no prudent company should have lost their entire war chest unless their funding arrived just yesterday. But when you're spending $10M or $100M a year, it's operationally challenging to make sure you never have more than $250K in the bank while you're doing it. (It's much, much better to be imprudent and have too much in bank deposits than miss payroll because you have too little.)