Is this really true? Banning the sales of seeds will not change anything because seeds were not ordered anyway. Seeds are send instead of the originally ordered item (the item to be reviewed). Seeds are light and cheap and will continue to be used.
These mystery seeds are bringing increased scrutiny to imports, and Amazon is taking this move to reduce it's liability.
I'm sure they weighted the alternatives (e.g. wait for legal action, implement change) and determined the least expensive route was to just stop the business.
https://lh3.googleusercontent.com/pw/ACtC-3eNO55-KL0ynsmXLT8...
Unfortunately they leave the loophole of completely changing a product listing wide open.