Chasing a player from channel to channel with the sole intent of preventing him to farm is not considered pvp but harassment. As usual we are the judges of this, if it happens once we won't take any actions, but if it is done frequently and it makes impossible for the player to play, then we will step in.
The maps are opened to every level because there are quests. We should block the entrance to levl 70+ and what if they did not finish the Uriel pages? They will be doomed.
Anyway there are no evidences posted and it seems the community will make "justice" without the need of our help.