Which clouds do this? I work quite a bit with AWS and GCP, and Azure to a lesser extent, and I've yet to see a spending limit on any of them. I'd love to be proven wrong though.
Not all Azure subscriptions types are like this though.
Also documented at https://docs.microsoft.com/en-us/azure/cost-management-billi...
Make a SKU that's not for production with a $100 setup fee to prevent abuse and prepaid credits for consumption.
Basically you add a budget to your project, create a pub/sub channel, then make a lambda that subscribes to the channel and turns off billing when it receives an overbudget message to shut everything down.
Or you could integrate it into your project directly to handle this more gracefully.
You can even send a test message, to check that everything does indeed shut down, but the whole process is extremely clunky and error-prone.
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Enterprise deals can end up changing the story it seems
The best you can do is build your own service to monitor your bill and manually cut off your billing account if it gets too high. Hope you did it correctly because there's no good way to test it! And the bill notifications can be delayed an arbitrary amount of time with no guarantees, and disabling billing can take an arbitrary amount of time too, so you can still be screwed even if you did it correctly.
I think it's a glaring hole in cloud platforms. I get it, it's hard to implement in a way that is forgiving and doesn't cause a bunch of support tickets from people who set their limits too low and made their site go down. But that's why people use cloud platforms, so they don't have to implement the hard part. It's beyond me why the cloud platforms don't do something better here.
You're talking a 'get paid/don't get paid' decision here.
When you look at this on a high enough distributed level, across enough users, this is the profit margin. Enough people can screw up and then be able to pay the cloud provider, that it is part of the business model. You're required to run some chance of producing a legitimate megabill.
Why be forgiving when your business model requires that you set traps for fools?