> I can see a real rationale for creating sanity checks using AI to more quickly/proactively catch pathological billing issues before they become HN nightmare stories

Right, so invoicing is still a deterministic problem. You can bolt whatever on but in the end it's just product x price x units

This is exactly the sort of thing that’s not possible, though. An AI will not be able to detect a “lambda loop” because it will look exactly like a “successful lambda rollout”. This sort of watchdog would just as likely shut down the wrong things and make AWS feel a lot less safe.