Well, I think the same point can be made here: if you need a price cap, then AWS is too expensive for you ;)
The problem is that AWS markets itself as “pay what you use” and generally that’s extremely little for me, but if I screw up with Glacier I suppose I could get a $100 bill because I restored some backups the wrong way.
You wouldn't be the first person to do that: https://medium.com/@karppinen/how-i-ended-up-paying-150-for-...
The whole idea of services like AWS is that it is scalable as a solution for startups, small businesses and large global corporations. Not just large corporations that would be considered customers of a "fancy" web services provider.