I imagine that they decided not to have $ limit as implementing that would be once you hit the $ limit, they will take your whole stack down completely. This includes anything you've had setup on AWS, which could be hundreds of instances of any of their services... which may or may not be feasible to do instantaneously or safely (without you losing data or breaking something.) Imagine pulling systems down in the wrong order or while writes or reads are being done... you now have no guarantee that your data will be in a good state.
It's always best to leave termination of your client's systems up to the client than to pull the plug out from under them... at least I'd like to think that's how they would have reasoned it internally.
It's always best to leave termination of your client's systems up to the client than to pull the plug out from under them... at least I'd like to think that's how they would have reasoned it internally.