Since this seems to be getting some comments. Yes, it is in fact easy to shut down an instance if it goes over a spending limit. As in you monitor traffic tied directly to the billing system and you set up an if statement and if it goes over the limit you shut down the server and dump the service to a static drive.

It's the easiest thing in the world - they just don't want to because they figured that they could use their scale to screw over their customers. And now you have the same guys who screwed everyone over with cloud compute wanting you to pay for AI by using their monopoly position to charge you economic rents. Because now things like edge compute is easy because everyone overspent on hard drives because of crypto. And so you have jerks who just move on to the next thing to use their power to abuse the market rather than build credibility because the market incentivizes building bubbles and bad behavior.

Smart evil people who tell others "no you're just too dumb to 'get it' (oh by the way give me more money before this market collapses)" are the absolute bane of the industry.

It's weird that you have people in here defending the practice as if it's a difficult thing to do. Taxi cabs somehow manage not to charge you thousands of dollars for places you don't drive to but you can't set up an if statement on a server? So you're saying Amazon is run by people that are dumber than a taxi cab company?

Ok, well you might have a point. And this is how Waymo was started. I may or may not be kidding.