Pirates usually do not have capacity to offload ship - they use small fishing boats and speedboats that won't hold even one container. Cargo in most containers

Pirates usually do not have capacity to offload ship - they use small fishing boats and speedboats that won't hold even one container. Cargo in most containers is not very valuable (who need container of t-shirts 600 miles away from closest shore?). Finding container with valuables (IPhones/etc) is difficult as there is no accessible manifest on the ship and opening containers is time-consuming. I also assume that boat will automatically inform authorities and navy/security will be able to reach ship in a matter of hours. With no hostages on container ship, security can just blow up fishing boat/speed boat pirates used and then wait until they run out of food/water on a container ship. Pirates won't be able to control engine/rudder so there is not much they can do other than to surrender.