> Also, hard dollar caps are rarely if ever the right choice.

Depends on if you're a big business or an individual. There is absolutely no reason I would ever pay $100k for a traffic burst on my personal site or side project (like the $100k Netlify case a few months ago).

> It's better to set billing alerts and make the call yourself if they go off.

Billing alerts are not instant and neither is anyone online 24x7 monitoring the alerts.