I'm using bare AWS at the moment because a) they gave me $5k in credits for YC SUS, b) they own the physical servers, and c) I can trust that they'll be around a long time, so I'd rather get locked into AWS proper rather than a service that might be built on top of AWS (e.g. CloudFormation vs. Terraform).
But I get, better than I did two months ago, just how freaking hard it is to build something, anything. This is amazing work, and I couldn't do it. Kudos to you, and I look forward to hearing about your amazing success!