All the donations being made are a drop in the bucket of the wealth that is being hoarded by others, as well as by the folks making the donations.

I agree that the widget factory owner created the situation where lots of folks have jobs, and that none of us would have the standard of living we enjoy without the efforts of him and his peers. However, he still made billions while keeping other people in poverty. Hundreds of thousands would pay his bills and allow him to live in luxury. Why does he need billions?