On: California’s container-ship traffic jam

[Scoundreller]

My guess is that there was no slack sea cargo capacity between Shanghai and LA, so once air cargo disappeared, more cargo went by sea.

Rotterdam-Shanghai, I have no idea, timeline doesn’t fit with COVID. This article suggests collusion between shipping companies, and some train engineers testing positive de-stabilizing rail cargo:

https://theloadstar.com/box-shortages-congestion-and-high-ra...