Given that the ships primarily being diverted are freighters / container ships travelling from the east to the west (and vice versa), it's not obvious why they

Given that the ships primarily being diverted are freighters / container ships travelling from the east to the west (and vice versa), it's not obvious why they should stop in Cape Town (since they don't need to refuel, and it makes no sense to unload at Cape Town). So no major benefit to Cape Town.