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The donation is voluntary, but the decision about who it goes to is not. That is controlled by an organization that does what it deems "fair". A government created organization. I or my descendnants should be allowed to decide where it goes, even if not "fair".

Fine, you can also do that I think there is no such strict rule or bar u from doing that as long as it is not a trade.

You can only do that if you are alive such as a kidney or partial liver. Directed donation after death is not really very practical unless a lot of pre death arrangements and tests have been done beforehand with the recipient. A majority of postmortem donations are directed by the organ procurement agency.