Why, if the company can objectively prove that Soda A can cure your medical ailment? Because these comment boards are about debate, pov, and information in a broader sense and not scientific investigations/claims, all that is required is you lay out a plausible and civil augment/point. If the poster believes it or not is irrelevant. If they are getting paid to say it is irrelevant. And by distorting the lens people view comments through, the strength and truth of those comments gets similarly distorted.