I'm not suggesting that. For a lot of casual users I'm not sure that cloud services are necessarily the best approach for an externally-facing service. They may well be better with a VPS that has a hard resources/dollar limit.

Perhaps cloud providers should have some sort of hard circuit breaker option (though it won't help for some things like storage) but it's probably not a priority as not a lot of businesses--their primary customers--would be OK with effectively hitting the power button for their entire cloud account if they exceed some dollar amount that someone or other configured a couple of years ago.