Well, if we stop chauvinistically assuming that the "Observer" of quantum mechanics must be a human, then the logical conclusion is that a particle is "observed" whenever it interacts with another particle, and that free will is an inherent property to all matter.
Conway explicitly provides a model of free will which doesn't rely on Many Worlds.
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he provides a model of necessary derivation of free will of collections of particles from free will of particles, he doesn't provide a model of free will at all; his fully baseless axiom of free will could rely on many-worlds or not, the question isn't asked
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As the person who brought up many worlds in the first place. It's not necessary for a "Non deterministic universe" but is necessary for the chaos of quantum mechanics to contain something humans would recognize as choice.
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If human beings have any choice in an inherently chaotic universe, it's because we chose which timelines to passively observe. In a non chaotic universe, nothing resembling free will can possibly exist.
End of conversation
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