Towards the end of the first episode on season four of Black Mirror, The USS Callister is damaged and Walton sacrifices himself by trying to fix the engine from inside. When the engine starts running again he is disintegrated by the flow of plasma or whatever. He doesn't join the crew later on when they move inside the real multiplayer version of the game so the question is if he has really died in the sense that his digital copy no longer exists.
Now if the answer to that first question is yes then why didn't everyone else just kill themselves the same way? They were aware that they are digital copies and they wanted to kill themselves anyway by flying through the wormhole, so why didn't they do it the easy guaranteed way?