Idea is to prevent new members from seeing Traps and Teslas on War Bases until the war is over, and prevent spies from attacking on Clan Wars when that player returns to his/her previous clan.
I'm not saying that we treat every new member of a clan as a spy. We don't leave our clan Open. Even if it is set to "Invite Only", there are still times that we get invites from the opposing clan.






