Well, Henry Ford might have been a genius, but ‘The Eternal Jew’ ended up being one of the most influential books in the Third Reich. Carnegie did a lot of good, but the Johnstown flood might well have been a big part of the reason he tried so hard to leave a positive legacy.
The problem with all foundations like those is that they don’t have to produce anything of quantitative value.
Another is that like all corporations, they are essentially immortal. That is one of the reasons why 100+ years of copyright makes sense to disney and others. The public domain has been robbed blind by these corporations.