do what you're doing now, GO PUBLIC about it, do blogs, videos, youtube, twitter, linked in content / posts, just put this out far and wide so Google quickly realise you are about to cost them million in lost business compared to your small mistake clocking up a big bill they can afford to forgive most of.. name and shame them massively.. they will eventually notice..
We are having this discussion continually since 2006. It was Amazon who, despite repeated promises that "they know it is a crucial issue for their customers and that they are working on this", ultimately refused to implement the hard cap on spending. Instead, they added a million features including alarms that basically warn you once it might be far too late, especially if you are not checking your mail every minute in the night. The other big public cloud providers followed their suit.
So the unwritten ritual is when you make a mistake that makes you bankrupt for life is to beg, pray, and hope for their mercy.
Check out my latest "Conversations with Dez" with Dave Robinson, Founder & CEO of Quarterbac, on the future of infra-tech & AI in asset reliability.