And the fact that you (and others) can't see how it inherently concentrates power is exactly what's wrong with the current views of pure free-market proponents.
Free markets are bad. Market competition is good. It's that simple and people still don't seem to be able to distinguish them.
The only way to have market competition is to soundly enforce it. Any free market left alone eliminates market competition and consolidates power - that consolidated power then eliminates any efficiency gained from capitalism.
One of the single most important roles of government is to eliminate heavily unbalanced concentrations of power un order to maintain competition.
In the marketplace that means swift eliminating monopolies, in individuals it means maintaining some tempers inequality, and in democracy it means ensuring any concentrated power cannot perform regulatory capture. But you cannot do the latter without ensuring the former two. Everyone seems to recognize regulatory capture and the imbalance of power it involves in democracy, but some how cannot see the exact same issues in the individual or the marketplace. All three require market competition to be healthy and thrive - and aid concentration of power.