Earlier quoted context omitted.
This is very bad for the rest of the world, and also for the US, since all the empty containers are stacking up there, then there aren't any empty containers available in China or anywhere else for exporters, so even getting your hands on an empty container can be very difficult or almost impossible, or they cost 2-3x more than usually.
If that is true the rates for empty containers should increase making it worthwhile for ships to bring them back again?
This sort of implies that it’s incredibly cheap to make the container, and/or it’s expensive to add that weight to the ship, and/or our ports are incredibly slow at loading empty containers onto ships.