I'm not convinced it will. Shein and Temu can throw so many packages at the US border with dubious documentation that even if CBP stops 3% of them, the business model still works fine.

In my corner of the world, it means lots of overseas artists won’t be able to easily sell their handmade yarn in the US. Many small fiber companies in Europe have suspended orders from the US because it’s so inconsistent; taxes jump from week to week, there’s no coherency.