Every business loves the free market when they're starting up but, once they're established, try their best to throttle it. They will use their money to seek government protections and market share to buy out to bankrupt competitors. A free market requires an active government to keep it free.As for the "wealth concentration" -- that's an artifact of destroying the easy path to entrepreneurism. Excessive Central regulation and control REDUCES the number of start-ups and IPO that can COMPETE with a few giant corporations.
My analogy is the NFL. They make the rules for every team and have a ref on the field to enforce the rules, they are the gov't. Other than that the teams are free to hire and train players and make plays as they see fit.