you are missing a crucial factor in your viewpoint, owning the majority of any such assets is not even desirable crossing a certain threshold, since it then becomes a liability - who are you going to sell those assets to when distrusts increases due to certain actions? any distrust will fundamentally be detrimental to one's own self interest due to value destruction.

furthermore, I heavily doubt it's even a realistic argument that a single high net worth individual could ever compete with a globally sized competition where it's easy to vote via: 1 cpu = 1 vote mechanism. it would be much easier with the traditional asics mining because the high net worth individual could have the money and means to buy up all the asics or produce them himself, but with the ease of availability of cpus, I heavily doubt that it's the same ball game.