In the days before, there used to be a hard spending limit - I know this because of an old official tutorial video on youtube. Last time I checked, there was billing alert functionality and they were recommending creating a function that will halt your service when it hits the limit - the problem is, billing lags behind and you can rack up a hefty sum until anything is triggered.

Amazing service but its a scary one. Every time a social-media-worthy accident happens, they cancel the bill but I wonder how many are burned without recourse.

Maybe if your rack up something modest like 5K accidentally, its better to push it as high as you can and get it declined on your CC and increase your social media prospects :)