It looks like even Everett had his own derivation of Born rule from his model, but in his model there is no “many worlds” but just evolution of unitary function. As I remember, he analyzed memories of an agent—so he analyzed past probabilities, but not future probabilities. This is an interesting fact in the context of this post where the claim is about the strangeness of the future probabilities.
But even if we exclude MWI, pure classical inflationary Big World remains with multiple my copies distributed similarly to MWI-branches. This allow something analogues to quantum immortality to exist even without MWI.
It looks like even Everett had his own derivation of Born rule from his model, but in his model there is no “many worlds” but just evolution of unitary function. As I remember, he analyzed memories of an agent—so he analyzed past probabilities, but not future probabilities. This is an interesting fact in the context of this post where the claim is about the strangeness of the future probabilities.
But even if we exclude MWI, pure classical inflationary Big World remains with multiple my copies distributed similarly to MWI-branches. This allow something analogues to quantum immortality to exist even without MWI.