Basically, if we are going to allow single humans to have so much buying power, that needs to come with some clear expectations.
Risks must be taken. Pick something and advance society. Or, empower others in a reasonable, non discriminatory way, with no hooks.
There are a ton of things need doing.
Why not require a real effort?
We do not need more dynasties, and other enduring signs of wealth.
We do need those people to have earned it. (That is the no dynasty part again)
I know sounds harsh, but the fact is anyone can live very well for the rest of their lives on just a fraction of that money.
May well put it to work.
And if it were me personally? I got a list. Ready?
But it's not: many of those billionaires are using their wealth to subvert democracy. They are quite literally enemies of the state.
The only lasting defense is to prevent this level of individual wealth accumulation.