The context was about being power hungry and ambitious to keep making more money, building a bigger business, perhaps fame, prestige, success, accomplishment... vs selling out early if just being a simple billionaire is adequate enough. Buffet worked his entire life as you said, which was my point, and was the richest in the world for a long time. He is not a counterpoint to Zuckerberg.

And all of the billionaires donate money, I don't think that sets him apart from the others all that much.