So where does the information how dangerous something is comes from? Are companies allowed to lie about other companies, because the first thing I would do as a

So where does the information how dangerous something is comes from? Are companies allowed to lie about other companies, because the first thing I would do as a competitor would be set up a "website" that propagates how dangerous other companies products are. This myth that somehow competition will sort things out really needs to disappear, it has been disproven again and again.