They're saying "give our customers your best price or you can't sell the item on our platform; you're free to sell it anywhere else of course for whatever price

They're saying "give our customers your best price or you can't sell the item on our platform; you're free to sell it anywhere else of course for whatever price you want but you just cant have access to our customers". Now I do think it hurts the consumer - as I reasoned in my post - but in a round-about way; one that that law currently doesn't seem to be able to reach.