This. I've had a very real situation with DataDog: I've accidentally created a Synthetics test (and forgot about it) on a test account and incurred $5k+ bill at end of month. Zero notice or anything.

I ended up swallowing the bill but will not be using them again since this is plain scary.

Edit: funny thing - to add insult to injury, I've started to hear from their sales people on "my growth plans", even though I've had a support ticket hoping to resolve this to no avail.