Possibly yes. Do we know how that would impact his motivation, or the motivation of future entrepreneurs who see what happens at the end once people become succ

Possibly yes. Do we know how that would impact his motivation, or the motivation of future entrepreneurs who see what happens at the end once people become successful? Why do you think common advice is to avoid too much dilution early on, or to avoid founder fallout with almost half the equity walking out the door. It's because, like it or not, this kind of thing motivates humans. Maybe you are a monk and can work hard for a company as a founder with very little equity, but knowing myself, I would never do that, and I am not so unusual as to believe I am unique in that department. Also I don't see this as a pure question of incentives, but also a question of property rights. He made that wealth via value add. We owe him our gratitude for that and have no right to swipe his property. If he stole that money or made it by spewing toxic pollution, then by all means take away his wealth.