This. In my previous company I was receiving almost every month some email from automated systems AND humans at AWS because either our finance dept screwed it up or AWS screwed it up but we had like hundred of thousands of $ in missing payments for months, and nothing happened (we always eventually paid AFAIK). Nowadays I think they are removing humans from the loop as much as possible though.
Indeed. My company forgot to warn the the credit card had been updated, emails were being sent to the work email of an employee that left... Took 4 months before they started turning off stuff, and even that was quite gradual, just enough to draw attention