The cheapest way to deploy a container accessible over HTTP is to use web-service resource (which uses AWS ECS loadbalanced with HTTP-Api-Gateway, which is pay-per-use) and use EC2 launch type (cheapest instances are only a few $). Not sure if it's still under AWS free tier, but definitely not expensive.

Regarding charing % of AWS bill - yes, we're changing that soon. It's going to be flat fee + 10% of AWS bill.

Our free tier covers 90% of vibecoder, freelancer and side-project use-cases though. So probably nothing to worry about unless you're a 2+ person business. And at that point, it's still far less expensive than having a DevOps person or learning all of the 150,000 AWS loopholes yourself.