This line of reasoning always amused me. Free = predatory? Can someone explain how one arrives at this logic?
If the thinking is that "free" leads to "monopoly" which then leads to dramatically increased pricing once all competition is eliminated, this has absolutely, empirically and historically, been shown to be false. It simply never happens. Or more accurately, if/when it has been attempted, this practice has swiftly been defeated by competition.
Edit: An afterthought: If free = predatory pricing, why do we allow charities to distribute free shelter, goods, and food? Surely these institutions are displacing some sales that would otherwise take place, thus negatively impacting those businesses that would otherwise have profited from those sales?