'gave to the world' implies the world didn't have this money before gates came along. Which is obviously not true and quite literally impossible.
Is the value of everything in the world higher or lower than it was 1000 years ago? If it's higher, how did it go up?
While you're at it, consider what portion of MS success is directly attributable to Bill Gates and not the many thousands of other people involved in the company and code it literally copied from open source projects. Not to mention the extreme anti-competitveness of MS and their aggressiveness in suing and shutting down other companies, and other negative externalities they generated.