Now I'm curious how the behavior of the people in the "first" universe, unencumbered by the idea of how affecting the machine's reality would affect their own reality, is different from the behavior of the people we see.
A sort of a Roko's Basilisk, except with an omnipresent dread that they might be say, the 2nd or 3rd universe and the first just hadn't messed with them yet.
If they do anything that scares or abhors the people above, they could be turned off. Maybe they're not even sure if the people above them are waiting to see if they only benevolently observe the universe below them.
But maybe also if they are too boring. :(