When I first started working with cloud providers it was shocking to discover this feature doesn’t exist, basically anywhere.
It’s such a basic thing, not having it has to be deliberate to make you accidentally spend more than you’d like.
Mistaken view.
I was a member of AWS customer advisory board for years. Two dozen of largest enterprises and unicorns and so on. Nobody wanted the billing department "inline" of systems controls.
AWS provides all the controls you need to flip the switch yourself, and provides the CDK / TF / etc. patterns for it. Plenty GitHub projects to host your own light switch service.
Don't relinquish the switch.
>It’s such a basic thing, not having it has to be deliberate to make you accidentally spend more than you’d like.
This is unlikely. The big cloud providers routinely cancel bills based on accidental usage. The real explanation is just that it's technically difficult to calculate all usage in real time and shut down systems immediately as soon as a certain cap is reached.