I don't think that's always the case:
> Such pirated titles are being sold directly by Amazon, not through third-party Marketplace sellers.
https://arstechnica.com/information-technology/2019/02/amazo...
Yes, Amazon could setup shell corporations, but if they got tracked back to Amazon, that would be the end of the company. Why not just setup a bunch of side businesses producing and selling legal things (like their batteries, clothes, etc. brands) and collect all the profit there, while allowing others to setup shell corporations and sell the illegal things? That way they collect some profit from the latter, but without any risk to the company. And, in fact, that’s what they do.
And then, of course, Amazon should turn around and sue whoever provided them the counterfeit product. But the first level of culpability is still with Amazon.
It's like if I'm driving, waiting at a red light, and someone rear-ends me, causing me to rear-end the car in front of me. The person I hit sues me, wins, and I turn around and sue the person behind me for both the damage to my car and whatever I lost in the first lawsuit (probably all via insurance).
New angle for the next trial: Amazon started taking double digits percentages of every sale and doing FBA in the past few years.
For physical products (consider thin margins after manufacturing costs), that means Amazon earns more money than the seller, thus they are the primary beneficiary of the sale.
Amazon has been sued many times over similar things. The precedent is very strong. They win every case because they are not the seller. Unless the law changes, there is little hope of this happening like you expect.