Because neutral ships also need permission to cross the strait, even if they have not been explicitly banned. Because the status of the blockade has changed and continues to change according to tensions in the region. Several countries have obtained permission to cross: China, Russia, India, Iraq, Pakistan, Malaysia, Thailand, and the Philippines. Even so, it is understandable that ships are hesitant to pass through there and are seeking less uncertain routes, because of the tensions, risk of war and because in addition to Iran, the United States also claims to have imposed a blockade and has attacked ships.