We are talking about the same exact item with the same exact features, just a different brand

There is no "vendor lock in" for t-shirts

You are not forced to buy walmart special editions using Walmart payment gateway and vendors don't have to pay Walmart a 30% cut, the opposite is true, Walmart HS to buy at least N items and pay in advance to be able to require a special edition, even though they don't know if they are going to sell all of them