Patent fights
I wonder if Huawei can so the same sort of thing as Qualcomm for 5G essential patents - insist on licences paying Huawei for a wider patent portfolio and buying other products"
"Oh, you can't do business with us because of the blacklisting in your country? Then, sorry you can't use our standards essential 5G set of patents which the rest of the world are happy and able to use".
I'm sure that this would cause a fairly quick waver from the Department of Commerce or whoever controls the entity list, but if Huawei tagged a lot of other things onto the package it could be quite complex to navigate and would slow down US 5G manufacturers.
Andy