I would argue that a collectively wealthy society with middle-class wealth can do far more good than a single philanthropist with god-levels of money. Buying cars isn’t bad, but you’re glossing over the fact that they’re classic cars, i.e. very expensive hobbyist toys; these are not daily drivers, and the point to the gross inequality of the CEO being able to have millions of dollars of play money while he treats real humans like numbers in an expense formula.
Plutocracy is not the answer just because you have one good plutocrat for every nine monsters, because you still have nine monsters countering the efforts of the one.