Just to expand on this. You can have a hard limit. For AWS, create a role/user that's essentially ~root like access. Make a lambda function that's triggered by

Just to expand on this. You can have a hard limit. For AWS, create a role/user that's essentially ~root like access. Make a lambda function that's triggered by a billing alert at your threshold to just turn off things from most expensive to least. So turn of the DB servers. So the apps error out and the users go away.