The only slight downside is his position is evidently dependent on Microsoft's patronage, but I'd rather have one seat in seven and an alternative offer and the ability to threaten to take most of the company with me for the alternative offer than one seat in six with a board that believed they could oust me if they didn't like my decisions.
Note that in the US, private foundations are not permitted to own a controlling interest in a for-profit company, so the example has to be a public charity. IKEA is controlled by a Dutch nonprofit foundation, but it has no obligation to the public except to give away a small portion of the profits.
https://en.wikipedia.org/wiki/Stichting_INGKA_Foundation
https://www.economist.com/business/2006/05/11/flat-pack-acco...