So, there is a straightforward question for Sam, why don't you give up your wealth now, same as all billionaires worldwide?
So spare me of the long rich guy "moral" story, answer is simple neither Sam or any billionaire around the world will. As usually when they do they do it through tax loophole relieves schemes, their money will never get to those who actually may contribute to this world if they could just free their time from the rat race.
So, when stronger AI comes online, there will be no fairness. All the immense riches will go to the same minority - that same minority or wealthy people will not give away as they will as always think that they are entitled to it. Same as Elon Musk believes that Tesla currently has a "fair" valuation.
... Fairness is a tricky word; it depends on the head, which is pronouncing it ...