These rules are set by the corporations that own the carrier medium, acronyms like "MCI,ATT,AOL,TW" authored in their image by "WIPO,WTO,MPAA" and others who are no friends to open borders and free speech, and in fact have been known to use litigation and coercion to chill parody and critique and any expression that is beyond their control. Those borders, by the way are governed not by Constitutional or National Law, but by corporate contracts between the private owners of the networks. This makes the net PRIVATE SPACE.