As it is stipulated in the " official Servers - ToC , guidelines and procedures " in the Harassment & Griefing section , last bullet point is : " Special consideration against these cases will be taken in PVE and PVE-Conflict servers."
So as many said , for PVE and PVE-C , it’s clearly a BanAble thing to do .
Unfortunately for our PVP players , the line is greyish and may be considered case by case .