I would think once you reach the scale that this becomes an issue you can afford someone or a team to be monitoring the system 24/7 able to respond to a price spike.

Price caps are for small scale stuff where you wake up on Monday and see 1000x the normal bill.

I imagine that the product folks at places like AWS are averse to introducing discontinuities in the experience based on scale. Little customers get the same experience as big customers who get the same experience as mega customers.

Obviously they’ve changed their mind about cost management in light of the scale and dynamism of agents, which isn’t too surprising.