itzg's docker image for Minecraft makes life quite a bit easier - switching mod loader, versions etc. with environment variables is simpler than continuously downloading versions and juggling directories.
Why not? Docker is effectively free on Linux. You only get the performance hit on macOS and Windows (since it runs the containers in a hidden Linux VM).
I wouldn't limit yourself to describing it as a game server daemon. It's effectively a IAAS / PAAS platform if you switch to a plugin model for those games.
Well done.
