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Those tag domains are defined because a number of game systems leverage them. We've pre-defined the tag domain so that there is standard domain in place that can be used by anyone running one of those game systems. This will make things vastly easier once content sharing becomes possible.
We don't actually reference them in our built-in categories, since most game systems don't use them. However, they are easy to add to categories for users who are playing the games that do use them.
Hope that makes sense!
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