I don't agree that this is evidence of why we should use one term over the other. If you asked an uninformed person what it meant for software to be "free" they

I don't agree that this is evidence of why we should use one term over the other. If you asked an uninformed person what it meant for software to be "free" they would undoubtedly and reasonably assume it meant free of charge. This isn't really any better, imo, than people thinking that "open" source just means you can access it.