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They do require it:

https://sellercentral.amazon.com/gp/help/help.html?itemID=20...

However, they do not enforce it (IME) until you break $10K/mo

That would make sense to me. Not to over simplify the issue but I would settle with Amazon having skin in the game period. They seem to be extremely good at engineering ways to deflect responsibility (financially or ethically).

That applies to domestic manufacturers and ones having legal representation on US soil. An "Uncle Liu garage factory co." obviously does not qualify as such.