You spammed that quote a couple times in the thread, but never provided a source. I found it (https://thriveagency.com/target-plus-marketplace/), and your quotation seems a bit selective, the next sentence is:
> Unlike Amazon and Walmart Marketplace, however, Target Marketplace is an invitation-only platform.
That seems like a significant difference. It also goes on to say they only have about a hundred partners, which is another significant difference.
Since your source seems like some kind of weird marketing site, here it is from the horse's mouth, https://plus.target.com/:
> Right now, Target Plus is an invite-only program but we do plan to accept partner applications in the future.
Amazon on the other hand doesn't work like a retail store. You aren't leasing a finite amount of space within the Amazon website. You are beholden to the search algorithm run by amazon which is a black box compared to an agreement made for shelf space in a retail store, you don't pay less for worse placement and you can't pay more for better placement, and Amazon continually tries to poach your business with low cost knockoffs and their search engines are uncannily tailored to prefer these results.
> Target is the epitome of pushing you white label brands down your throat from the minute you step into own of their stores. And this is essentially what every retailer does.
But Amazon isn't a simple retailer. Isn't the issue that they do this and operate a third party marketplace? IIRC, Target is a traditional retailer that doesn't operate a marketplace for other retailers to compete in.