In case of America there are exceptions like edu, com etc. But in most of the cases they have been used before the code was decided and they are kept the same because of historical reasons. Hierarchy of the NIC's around the globe 2. The Internet and telecommunications infrastructure of Japan are on the way to being the world's best. It is almost certain that the Japanese Internet market will become the largest Internet market in the world in terms of number of users and in the amount of actual Internet commerce that takes place.
Commerce is about marketing and branding strategies.
Using unique names to designate a service or product. Remember that Japan is the second-largest Internet market in the world. Many companies have more than one product or service that they sell. For example some 0120 free dial numbers are quite valuable and are bought and sold based on how easy the number is to remember. This is only a sample of thousands of similar U.S. businesses.