I had a class last semester where we were required to use AWS. Our professor tried his best to teach everyone how to be responsible with their tool use and how to predict their costs (As well as how to set up a free education account and get AWS credits). I was amazed when final presentations rolled around my group had a total cost of 4.30 dollars after 5 months of uptime and use, while other groups had costs ranging from 30 to 150 dollars! I use AWS for my job so I guess I just never really went through those growing pains, but no system should be that easy to rack up costs unknowingly.
