Remember that guy on Reddit who claims he had to have his leg amputated and he somehow got to keep it, and he and his friends cooked and ate it?
That's weird, but as long as it remains their own, or consenting others, I think it's fine. The minute capitalism gets involved I think it becomes exploitative and unethical - long pork in the grocery store fundamentally should not be a thing.
God help me if I live in some commie zone where they take my amputated body parts to give to everyone. I grew those and they're mine! Fuck your science, I wanna eat my foot.