Recently articles popped up of how someone created a working ALU in Minecraft. For example, this article on ALU in Minecraft. He is quoted in some articles saying he is going to take it a step further and create a real-working computer in Minecraft (a computer in a computer).
If he achieves this, what could be a possible application of a real-working computer inside a video game? Or is this more of a video game simulation of how computers work?