Regarding the AWS Resources being used: The cost estimation feature is on the roadmap, telling you how much exactly one Project costs. And showing you in advance how much more changes will cost.
Using SetOps starts with base costs since we need at least one EC2 instance + database running and some other services. The base costs are ~130$, including your first apps. But launching your first 10 containers doesn't bring many additional costs, so running some apps are quite cost-efficient.
Someone else already stated here that something is missing in the docs regarding the services provisioned in AWS. We will deliver that! For now, I can show you this slide from the internal pitch deck: https://static-media.setops.co/infra/aws-components.png