RHEL8 is a mess but it isn't all there is to Linux.
Are you talking about Amazon Linux 2? It's based on Fedora/CentOS, but changed enough at this point to be its own thing.
Plenty of Debian, Ubuntu, Alpine, etc. out there too. We use non-AWS linux in Lambda as images.
Regards,
-scott
Welcome to Rivendell, Mr. Anderson.