Because you can buy the same exact item on Zalando and put it on fire if you want to
Imagine if you could buy shoes only at Walmart because you bought the shoe rack there.
Imagine if you could buy shoes only at Walmart because you bought the shoe rack there.
No you can't. Walmart often requires vendors to make a special Walmart-only version of their product. So there is nothing that's truly comparable.
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