With that much money you can just pay an entire team to find places to send it for you.
He does, it's literally what the Gates Foundation is for. It isn't easy to just give away $100,000,000,000 and trust that even half of that will get meaningfully spend and that it won't actually wind up getting abused by assholes in powerful positions and making things worse. That's $14 million per day for twenty years.
It has been a winning strategy for SoftBank. When there are gigantic sums of money sloshing around, the waste can become enormous.
You pay a whole team of tax advisors, and lobbyists, so that no politician of enough weight in 20 years, says the magic word: "Billionaire Tax"
That's a great strategy if you don't care where it goes. You'd probably be surprised how quickly money can disappear when you have people motivated to spend it.