Man, you didn't read what was important.
The admins generally own the forum site. They choose moderators. Admins set the theme and the rules for the web site, and with the assistance of the moderators, enforce those rules. The point is, these forums are private property, and as such, if the owners say no cussing, then no cussing.
This is like the sign in the restaurant that says "We Reserve the Right to Refuse Service to Anybody." And since a restaurant is located on private property, they can enforce that rule for whatever reason. |