When I was in highschool, my friends and I were doing a small project. My friend accidentally ran Google's image recognition service in a while loop for a whole minute, and racked up a $300 bill. Thankfully GCP waived it for us.
I ran up a $4,000 bill with like a week of TPU time bc I didn’t realize that they kept running after the attached CPU turned off (unlike GPU offerings).
GCP also waived the whole thing - even refunding the $4k they had already pulled from my payment method.