That the "essential products list" does not exist, which is the key complaint in any discussion about this. Amazon invented a requirement that does not exist to claim that the requirements are to vague to implement. The list the court provided is explicit in the court documents, meanwhile the "essential products" is subject to the imagination of every armchair free market capitalist. You wont find it googling, you wont find it going through court documents, you will only find an unending sea of discussion how stupid it is for a court to require something as vague as selling only "essential products" and how Amazon shutting down its french warehouses was the only sane response to this requirement.
> I would imagine amazon would have preferred to keep operating, so I believe them.
This was an union driven lawsuit. Shutting down operations to stamp out union activity is rather common with companies large enough to cover the short term costs of it.