Ironically the street guru hucksters might have a better track record than the dangerous products mentioned above.

Less charitably, it's a mistake to imply that simply being a bigger corporation makes you go from street guru to "expert". Bigger company trying to make money off of you at any risk to you is just the same bucket at a different scale. In this context the other side is probably "expert consumer advocate" since that fits the idea above of these dangerous products advertised as cure alls.