they have alerts that can email you if you are approaching a limit but i don't think you can tie that to some automated shutting down of your stuff (i might be wrong i haven't worked in aws heavily for about 2 years now... believe others with more recent exp if they comment otherwise) tbh i kind of get why it is like this, aws is a business and they are only looking for your money. responsibility for keeping your pants up at aws is on the admins.