Unfortunately like every system we have tried to do at scale, capitalism favors concentration of power over time and being gamed by some folks or others. Humans love to surrender power to the powerful up until some breaking point.

So corporate oligarchy is an expected long term result of capitalism. Unfortunately some other type of oligarchy is the outcome from alternatives once the “wrong” players figure out the rules of the game and how they can break them as needed to get an advantage over those following the spirit of the rules