I'm surprised this isn't law. Should it be?
If the CEO of the electric company didn't mandate circuit breakers, he should go to jail.
You can rack up an outrageous monthly electricity bill without tripping a breaker.
Google implemented caps because their competitors offered them. Before that, customers could choose one of several competitors, rent the GPUs at a fixed rate, or buy the GPUs and install them on-premises.
At no point was any law needed to solve any of this.