1. Sell $500M of shares they are keeping, hence dropping the price of the companies they are invested in. Employees of these companies lose.
2. Give the $500M, but to whom? Can be to "the poor", but what will be generated this way? The people will be better off temporarily (some of them permanently, of course), but the money will randomly radiate away to the whole economy. But you can alternatively give the money by investing in e.g. startups, incubators, hence magnifying the potential success of ideas you believe in, and people who can statistically get things done better that the average person. The side effect is that you'll be probably richer from the new investments.
Money is not a static resource rotated around the world.
- It's a measure of capability/intelligence/luck/circumstances of birth.
- It can be generated out of (generally) 'getting things done'. Two people creating things out of nowhere are both richer.
- It's a magnifying glass you can use to advance ideas you believe in.
- It flows from those who spend it, to those who generate more than spending (so, by definition, are able generate more of it by using it - the statistically "rich")