I read this sentence
If you are hosting a web application in the cloud, then you are probably used to paying data egress charges for your outbound traffic anyway, so you will be comfortable with this charging model.
in the following post https://www.logicata.com/blog/dont-get-caught-out-by-aws-data-egress-fees/
How are egress costs calculated? Is it based on all the outbound traffic of my apps? Even what would be served in a website? Or is it only when doing data transfers to servers outside of AWS?