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That's for direct to consumer mail shipping (USPS) that like DxExtreme, Wish, Aliexpress, etc use. FBA shipments are usually sent directly in bulk to an Amazon warehouse from China thru normal commercial shipping companies and wouldn't be affected.

FBA isn't just used for generic products from Alibaba, it will survive no matter what happens with China.

Almost all sellers I saw were happy about that. FBA sellers are importing in bulk, not in small packages that were subsidized under UPU.