Of all the billionaires who do exist Bill and Melinda would probably agree with you. Bill has been pretty clear that he always played the game to win but he’s also stated he intends to give it all away and he’s openly recruiting other billionaires to give it all away as well.
I suppose evil billionaires could give it away to make the world a worse plCe, say by developing something like sharks with lasers on their heads, But again in these guys case they’re giving it away to help eliminate malaria around the world.
If all billionaires were like Bill and the Melinda I suppose the world would be a significantly better place.