Once he has donated it to the foundation, it is no longer fully under his control. It is a charitable organization, and subject to many laws about how the money

Once he has donated it to the foundation, it is no longer fully under his control. It is a charitable organization, and subject to many laws about how the money is spent. So it's never included in any measure of his total wealth. (GP's point is that if it were, and also all the past charitable spending was, then Gates works be richer. (