Re:Tell HN: I DDoSed myself using CloudFront and Lambda Edge...
by heretogetout on Tuesday June 28, 2022 @12:20PM
(#31909687)
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.
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.