Might an aligned superintelligence force people to "upload" themselves, so as to more efficiently use the matter of their bodies?
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Matter in the body is probably not the main thing, but rather the resources needed to support and benefit the person. It takes much less resources to give an emulation a good life than an embodied person
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Aligned systems as a rule do not to force people to do things that they don't want to do. If it’s forcing that it’s probably not aligned.
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In the long run, future moral entities might all/mostly be emulations, but there is no rush to get your particles. There are plenty of stars.