I learned a lot of stuff about networking, how AWS works (VPCs, IAM, CloudWatch, etc) from trial and error, and hobby projects like personal websites (free tier), hosting a Minecraft server, etc.
Being too overprotective can have negative consequences on folks who are responsible. One of the things I love about the technology and internet communities, etc is that you're mostly judged based on how you act and behave; not your age or other visible characteristics.
I get that (and why) some people won't use AWS or its main competitors for this reason. But, frankly, they're not AWS's market and AWS will basically shrug.
How does that work in the case of AWS? Are you confusing alerts to caps?
In my mind I could see a true tradeoff to removing the ability to do this. If I'm in a critical situtaion where, say, my service is on the cusp of failing because my revenue 100xed in a short while I know I could just go to AWS, put in some data and buy enough compute to survive as a business.