I don't think it's fair to call AWS a scam. It's complicated and powerful and it charges a lot for many services compared to a DIY approach. But you can see the prices transparently on its site, it provides a free tier to try most services out, it is fairly good about long term support for services and how it handles forced upgrades when they become necessary, and generally it has an OK reputation for customer support even if something unexpected and very bad happens. You're certainly paying a price for the convenience and the brand but I don't think that's a scam if you're making an informed choice. If you want to save money then you can replace RDS with Postgres running on VMs but the trade off is then you have to manage your database infrastructure yourself.