> In the future we might be able to simulate a human on that level. Is it really alive? Does it have rights?
Purely probabilistically, we are such humans. If any 'base' universe can easily simulate humans, for fun or research, such simulations will soon vastly outnumber the 'real' people. And because of that, we have to assume we are in an ancestor simulation.
I really disagree with the fundamental assumption there.
I find it very difficult to believe that a base universe could ever simulate something of the complexity of our universe without massive and pointless expense, at best. And even if they could, I find it even more unlikely that simulated universes would ever even be dense in the subset of multiverses (whichever flavor your like) which contain something like humans.
I agree, and additionally, it might take an awful lot of time until a civilization is advanced enough to reach the point where it can simulate other beings. For all we know, we can be the first beings to ever reach this point.
Purely probabilistically, we are such humans. If any 'base' universe can easily simulate humans, for fun or research, such simulations will soon vastly outnumber the 'real' people. And because of that, we have to assume we are in an ancestor simulation.