Yep, hence "Capitalists Hate Capitalism" [0], and if we want to keep the core thing (as opposed to Manoralism or Feudalism in a mask) the participants can't be allowed to destroy it with monopolies, monopsonies, and regulatory-capture.
But if capitalists can't have unlimited power then is it really capitalism? Capitalism is defined by capitalists having most of the power in a society.
I think if you proceed in that "unlimited power" direction, what happens is you land inside regions for which we already have other--much older--words (Manoralist, Feudal, Monarchy, Despotic, etc.)