They said something along the lines of “the real mission is to test the human spirit”, so if almost seems like the mission was an expirement to see if they could depend on the system for real crucial missions.
That’s the only logical explanation. Their reality has the ability to instantly transfer consciousness, build completely lifelike Android-clones, create artificial gravity. The only way the whole thing “works” is if it’s more a psychological expirement.
Demon79 is what you get if O. Henry wrote a 60s/70s thriller. It doesn’t fit Black Mirror at all beyond the “there’s a twist”.
That said, I loved it. Give it a rewatch but go in as you would for Insudious, The Conjuring or any other creature feature. It shifts the expectations and helps a lot.