The others die in his Everett branch, but they live on in others. Then the only result of the game is that the guy who wins will enjoy a much better quality of life. Let us assume that none of them have families or very good friends. The others are executed in a completely painless manner. Unlike in Russian roulette, here only the participant survives whose code was flipped. The organizer flips a quantum coin four times. They are put to deep sleep using some drug.
Each of them gets a unique four digit binary code assigned and deposits $50000.
The quantum Russian roulette is a game where 16 people participate.