Again, they give you the tools for this. You can understand your usage by API, you can set threshold actions on it, you can switch things on and off, and applyable templates exist, all of which are under your control and "out of band" from the systems delivering traffic or compute to your paying customers.
Stop defending a dark pattern that is making them a lot of money.
Using these tools can you switch everything off immediately (or at least within a minute) of total billing going over $X? Because if not, you're being disingenuous