Every individual and organization, be it from a family unit to a city to a corporation, is geared towards survival, growth, and profit. I'm not sure why you're using that behavior as a club against corporations when it's a natural behavior for us all. That these organizations gain power and profit, and then use all means to grow and maintain that position indefinitely, is nature. That individuals within these organizations work to survive, gain power, and profit, too, is natural. But, Supreme Court rulings notwithstanding, corporations are not living and breathing entities, they have individuals taking care of each task. So the above poster is correct, we need to hold those individuals accountable.
If you want to make an argument against corporations, make it about size and streamlining. Just like nature, a free-market can't exist when an part of that system(species) gets so large that it interferes negatively with the whole system. There is nothing inherently wrong with capping the size of a corporation - in fact it's better that we do it early. On the corporation level, sure, a narrative exists that says they'll "lose" money. However in the larger system, that money is still at play within the market. In fact, by forcing corporations to spin off and splinter, that money will change hands more often and stay in the market longer. Smaller organizations will be better able to compete on the merits of the product or service, rather than trying to sneak gold from dragons protecting their hoard.
Streamlining is also problematic to a free-market "naturalistic" system. In nature, an organization (say, an ant colony) need individuals for task completion. While I understand why the poor overworked queen may appreciate having a robot to bring her food and do the housecleaning, unfortunately that throws the whole system off and displaces a bunch of hungry, and now angry, ants. While a few of them might find work building robots, the rest are despondent and prone to misadventure and/or tragedy. (And at least a couple are plotting against the queen)
Sure the queen need not produce so many workers, and so she may not be in danger from her once-loyal minions, but corporations do not have the ability control the population, only reduce the amount of the population needed. Guess what? There's a lot of hungry and angry ants roaming about.
Corporations today are getting bigger while using less people (who cost less now, oversupply), and because of their size and natural tendencies they make it harder for new businesses to flourish - even with a labor market that is artificially depressed by automation.
I don't know if it'll fix the problem for sure, but capping size and taxing automation at a rate equal to what an individual doing that job would pay to the State seems like a good start to limiting corporate power, increasing jobs, and getting us closer to a true free-market system.