Companies can use anti-competitive behavior to curtail your rights in all sorts of ways. Look at America's storied history with company towns. Free speech doesn't get you very far when being blacklisted from the company store means you starve, or your company scrip that you've been being paid in is no longer accepted to keep you housed, or they pay the Pinkertons to beat you senseless for using the word "Union". The reason we don't have that anymore (well, except for that last one Amazon) is government regulation.

The government at least has the obligation to appear as if it's beholden to your will and rights. Corporations have no such qualms.