Seems like an advanced race of aliens would be able to clone and farm their own humans.
Maybe they prefer free range humans? Perhaps all the consumed PFAS and microplastics give Earth humans a certain “je ne sais quoi” that the aliens can’t reproduce on their home planet.
For those of you asking for details about what the Kanamits want, that’s up to you to try to negotiate with them. Keep in mind they may or may not be acting in good faith.
Oh, come on now, sure, they’re flesh-eating alien monsters who are blackmailing us into a morally and ethically corrupt bargain, but they’re not barbarians!
Heh. I thought it was going to go another way, there. I recall a story, can’t find it now, where the aliens offered a similar deal, except that what they wanted to do was have humanity prove it was “disciplined” enough to deserve the technology, by making all the fat people lose weight and conform to an idealized body type.
Turns out, it was a test to see if we’d act morally enough to refuse to accept such a biased deal.