I think CloudWatch billing alarms [1] are the only viable "solution" for an average joe here. Of course, they do not actually stop the usage, but at least they bring automated awareness.

Even with that, there's no easy way to rename an S3 bucket [2], plus doing so would commonly require updating config + re-deploying any apps using the bucket too...

All of this to say, the customer level really feels like the wrong layer of abstraction to solve this problem.

[1]: https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitori...

[2]: https://stackoverflow.com/questions/41511034/how-to-rename-a...