Had this bite me for my small-scale personal AWS setup. Have an AWS account I run some personal sites on, a Mastodon instance, etc. Got some Billing Alarms I setup that my bill went from normally $100 to $180. Got a $75 charge for USE2-ExtendedSupport:Yr1-Yr2:MySQL5.7 I mean I'm very used to Amazon's ridiculous fee structure but even this one caught me for a loop.