Thats really more of a sign of oligopoly limiting competition among brands and/or collusion among oligopolists. If the market for the goods and services being advertised was actually competitive nobody would risk that for more than a very short time, as the first company to ignore it would have an advantage. They may create a new brand selling essentially the same product and advertise that on edgier engagemwnt sites but they wouldnt do what they have done if the market was actually competitive.