Company Specific Categories?

I'd be interested to learn how the determination is made that a company with a network of sites is worthy of having theit own category.

As an example,

http://dmoz.org/Regional/North_America/United_States/Business_and_Economy/Legal_Services/Referral_Services/

lists several firms at the bottom who have their own category. Each site in the category is a small info site dedicated to a specific area of law. None of these categories have editors.

Were these categories originally setup by an editor associated with these firms, or was a decision made higher up the chain that there was something special about these firms that made them deserving of their own category?

If the latter is true, what is the criteria, and how would a similar firm go about requesting their own category?
 
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