AWS is a luxury product and the outbound charge is the delivery fee. You will also find that the delivery fee for a Louis Vuitton bag is more than for a pizza.
The egress is a way to snare a lot of extra margin.
It's 100% clear that orgs. wanting to host large public platforms will have 'major concerns' over this pricing issue but that's not their target market.
I'll bet most HNeers are thinking in terms of 'Hosting my App' there vs. AWS Bread and Butter is mostly hosting corporate IT services, which is a different thing.