The submarine dude that got rid of a few more in one go?
A single good thing that a single billionaire has done? The Gates foundation fighting malaria. I think that’s good.
Mark Cuban is a bit of a wall street asshole, but he’s created a drug company to slash the prices of generic drugs for Americans: https://www.npr.org/2022/01/24/1075344246/mark-cuban-pharmacy#:~:text=Billionaire investor and Dallas Mavericks,of its online pharmacy Wednesday.
It’s pretty easy to come up with some things billionaires have done that are good. Bill Gates funding cures and prevention of diseases in the third world is one that comes to mind.
Now, if we’re talking about finding an example of a billionaire whose life is on balance a good thing for humanity…that’s pretty much impossible.