It's not morally neutral the people will die, and you can choose to profit off of it or not which leaves a mark on you. The profit will be meaningless in the end because there will be no one to share it with, and nothing to spend it on. You just pulled it because you wanted a worthless piece of paper which you used to define your self worth you did it entirely for yourself nobody else. In this world there are no shops people or anything to spend the money on. Just you a pile of corpses and a piece of paper which you could have left on the floor because who cares about it other than you.

Yeah, from the problem description, that lever might as well be attached to a slot machine with the message "Play NOW to win $100". But because it interacts with the rails, you might appear on surveillance camera footage or fingerprints or whatever, and now you gotta explain yourself.

Totally worth it, if you could save their lives. But if it's clear right away that you can't, then that is not worth $100.