There is no secret or conspiracy, just companies using somewhat different business and marketing strategies. Brand names are just that, names. The owner can put it on anything and a licensee can put it on whatever the license grants. The owner of a name usually tries to protect its value by putting it on or only allowing it to be put on products of suitable type and quality, and perhaps controlling distribution channels. What constitutes suitable type and quality depends on a lot of different things, often how dire the owner's financial circumstances are.