Srsly?

The mighty cloud provider can't solve this issue?

Google has second precision billing on compute.

Its not hard to define a base layer of allowed billing increase and adding this type of context to resource allocation.

You are not just suddenly creating a mlllion terabytes of data or a million db requests without supervision.

It could even be as simple as basic level caps like 100 euro / month, 1000, 10.000 etc.

And there is a difference between stoping everything before the spike happens vs. also deleting stuff.