You’d have to ask the aliens about the ethics, I’m just the abducted manager. But if I’m selecting copies I would easily be able to screen out uncooperative people. And they wouldn’t have a choice once they were created they are just as abducted as I am, a being that wouldn’t exist at all without the experiment. Their choices would be to participate in the experiment as a new being and potentially become the progenitors of a new humanity, or ostracization with the potential to have the new humanity be obliterated because of their lack of participation. Either way they will still be fed and sheltered by the collective and owe their entire existance to the experiment that created it. How many people would choose to be a hermit for the rest of their lives? And how many people who are collaborative do you need for a society this automated to function? Honestly i think people would get over their divisions quickly when their bellies are full and the rent is free. Who will care about the old life when the new one is an undreamed miracle. And if people are really sad about it we can just make some of the million copies of their family and friends as long as they aren’t trying bring along their cousin Jeff Dahmer or something