Last I've checked Gates donated $60B to his foundation and now the foundation controls $90B. They got so many other donations Gates now controls more money then before.
You make it sound like this is a money making scheme but he's still out about $170 billion compared to other billionaires who pat themselves on the back for a $10k donation here and there or try to use their money to destroy democracy so they can be even more obscenely rich and powerful. $200 billion will go a long way in a developing continent.
Which still has no material impact on his well being and keeps most people distracted from his behaviours from all kinds of inappropriate conduct at Microsoft to his efforts to rehabilitate Epstein after his first conviction, with a bunch of economic crimes and things that should be economic crimes in the middle.
He's doing this to distance himself from Epstein, and him being ruthless business in the 80s and 90s. Even his vaccine initiative has a ulterior motive, look up vaccine colonization and gates.
Nothing any billionaire does will ever have any material impact on them financially.
Whether or not billionaires should exist on the first place is a separate topic that I'm guessing we both agree on. But they exist nonetheless, and they certainly have a material impact on the world, so all that leaves you with is comparing them against their peers to get a better idea of how truly greedy the worst of them are.
You make it sound like he actually lost some money. It's all just for show. It's not like he wanted to buy something but decided to donate money instead. He can still afford absolutely everything he could even want. He's not poorer in any meaningful way. The money his foundation has gives him power. Power to influence governments and policy (like he did with common core). His foundation has now more money than he donated so he has more power than before. It's a PR stunt.