Yes, 'fairness' is often a concept that gets invoked in these sorts of discussions.
For my own part, given world W1 where I have X1 and the best-off people have Y1, and world W2 where I have X2 and the best-off people have Y2, such that (X2 < X1) and (Y2-X2) << (Y1 - X1), within a range of worlds such that X1 and X2 are both not vastly different from what I have today, I expect that when transitioning from W2 to W1 I would experience myself as better off, and when transitioning from W1 to W2 I would experience myself as worse off.
I expect that's true of most people.
It's not necessarily the only important question here, though.
Google's announcement, Time magazine rather sensationalist headline.
In any case, it's nice to know that Google set its sights to "challenge ... aging and associated diseases". Apple's Tim Cook:
For too many of our friends and family, life has been cut short or the quality of their life is too often lacking. Art is one of the crazy ones who thinks it doesn’t have to be this way.
One more step towards "world optimization".