Im kind of struggling with this logic, because a conscious choice was made to engage with AWS, AWS having opaque billing and the ability to provide a huge amount of compute (even at high cost) at the click of a button should be known to anyone who did his research on providers.

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.

Anyone can make mistakes at some points and it's not like AWS UI/offerings make it any less confusing.