You could see this coming a mile away when the Leegin decision was handed down. It would seem the burden/expense should be on the manufacturer to track down its contractual client that’s responsible for passing along underpriced goods.
If the ebay seller has no contractual relationship to the manufacturer where is the cause of action? Those pushing for the Leegin-like laws (alliterate!) didn’t think through the real world implications of their enforcement. Talk about a can of worms.