Let's say that across the multiverse all versions of you are going to collectively live for 1 billion years. Unfortunately, some versions of you will be tortured and let's assume that collectively you will be tortured for 10,000 years meaning that the measure your torture is 10,000 / 1 billion. But if you sign up for cryonics you most likely only get brought back in a world that has cured death and isn't evil. If many versions of you do sign up for cryonics say you live collectively for 2 billion years and are only tortured for 11,000 of these years so the measure of you being tortured is 11,000/ 2 billion.