[bombcar]

Because the downside for a company isn't "oh it was off overnight" it's "we finally hit it big and made zero sales because AWS shut us off".

Given how easily they reverse the bills, I suspect that they have a policy of doing it (perhaps a few times per account, something to prevent abuse) because they really don't want to trigger the above scenario.

[heretogetout]

Alternatively it's "we would have made a profit this month but a bug in this one service chewed through our budget in one hour". Sure, you might be able to get a refund, but that's no way to plan a business.