Let's take this case: I don't want to be billed anything and I didn't upload my root creds to github for hackers. But I still don't read all the fine print and

Let's take this case: I don't want to be billed anything and I didn't upload my root creds to github for hackers. But I still don't read all the fine print and start getting charged. It hits 100$ and my limit is 100$. Amazon starts complaining. I guess I'm hoping a low limit would cause Amazon to start complaining and throttle/restrict. Yes it's not perfect, it would be better to tell Amazon to never bill and not let me use anything that costs money. Which they won't do, for revenue enhancement reasons.