I don't think it would be immoral to eat that sorts of meat, even if it's 'cultivated' human meat.
I guess there would have to be in-depth investigations into the possible health implications, though. (Not sure why I think that, it's just that humans seem to have a pretty strong instinct against eating human meat, and these instincts usually arise for a reason. Mind you, there have been - and still are - cannibalistic cultures, so maybe I'm talking through my hat, but these seem to be relatively uncommon and also consume human meat mainly as part of a ritualistic practice/ceremony rather than for their everyday meals...)
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