Is open-source infrastructure safe?

My AWS infrastructure is publicly available here. Is this a security concern?

I was prompted to ask this following the Capital One breach and after learning about https://opensourceinfra.org/

PS 1: Please be nice and don't hack me if it is indeed insecure. I did my best in reviewing the repo for security breaches. I'm just posting this here for the sake of public knowledge and public good :)

PS 2: This question was originally posted on stackoverflow.com here. A user replied saying that EC2 instance ID and VPC-related info are sensitive, but I found this post saying it's safe to share EC2 instance IDs.

Edit: apparently I need to move this again to security.stackexchange.com here

Edit 2: I ended up moving the question to reddit where I got much more feedback.