My concern (for non-paying or low-paying side projects) is not so much the difference between $5 and $10 for monthly hosting - that's like the difference betwee

My concern (for non-paying or low-paying side projects) is not so much the difference between $5 and $10 for monthly hosting - that's like the difference between one or two cups of coffee - but what safeguards are in place to prevent me from inadvertently exceeding an expected amount due to a high traffic spike, misconfigured cloud function or whatever. So I don't really care if one service costs x2 if the difference is between 5 and 10, but I care a lot if I could accidentally end up with a $2000 bill one day (and warnings don't count - not much good if I get a warning if I'm away from my laptop in a log cabin or something).