How about a /working/ demo?
The page which the article refers to really shows the narrow mindset of a modern company. I mean, here are the (10) steps to run the demo:
1. Install the Minecraft client, you'll need a Minecraft account.
Done, I'm actually a Minecraft player myself so no problems here.
2. Run the following commands: "docker pull gaetan/dockercraft"
So I open up a command window (cmd.exe) and....
C:\Users\Peter>docker pull gaetan/dockercraft
docker wordt niet herkend als een interne
of externe opdracht, programma of batchbestand.
In other words: bad command or filename.
Great demo indeed! Isn't a demo supposed to allow people unfamiliar with the software to learn how it works? So why rely on the software you're trying to demo in the first place?