Except, as a seller, I have multiple avenues to deliver my product to customers other than Walmart. On top of that, Walmart charges a fee per sale [1], and doesn't get to double dip into additional services rendered on top of that product. As soon as the sale is done through Walmart, they're cut out of the picture. Could you imagine Walmart demanding a 30% cut of profits if I sell a video game with in-game purchases--just because they performed the task of stocking it on the shelf?

[1] https://deliverr.com/blog/costs-of-selling-on-walmart-vs-ama...