"I'm sorry but we can't revive your husband from cryonics" "What, why?" "DMCA notices. His memories contain copyrighted works."
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Level 1-4 from Tegmark, eternal recurrence from Nietzsche, and modal realism from Lewis all yield the required conclusion. The main thing you need to be true is that for nearly all claims you might want to make about the world, they will be valid in some but not all worlds.
I can conceive of a sort of anthropocentric evolution taking place at the scale of worlds on this basis, I just don't buy into most claims about personal ability to influence the process.