To the author's point - if you have a strange charge on your credit card your credit card company will reach out to you and let you know. AWS should have simila

To the author's point - if you have a strange charge on your credit card your credit card company will reach out to you and let you know. AWS should have similar controls - if your spend gets out of control within a X amount of time period they should reach out to you. Many of the CFM platforms have this as part of their suite of tools (usually called anomaly spend or something similar) and AWS should offer some native tooling.