I think that problem is more commonly referred to as Parfit's hitchhiker.
I think it varies somewhat. Normally, you do have to one box, but I like the problem more when there's some probability of two boxing and still getting the million. That way, EDT tells you to two box, rather than just getting an undefined expected utility given that you decide to two box and crashing completely.
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.