That, in itself, is just curious. But the interesting lesson here is that the real thing has not been "web presence" or world wide visibility, it was Amazon has built a pretty impressive logistics setup for moving stuff from vendors to users. It rivals what Sears & Roebuck did in the 60's and 70's. THAT seems to be the missing piece which one might call "logistics as a service."
It makes me wonder why Aliexpress doesn't have more warehouses in the US. Clearly there are a number of Amazon vendors who buy from factories advertising on AE and then drop ship to Amazon, and sell at a markup that covers Amazon's take and gives them a profit. So basically Amazon is taking a big piece of the "value chain" from factory to customer. If you can run a distributed logistics operation at 20% or even 15% of the market value of the goods your distributing, you can under cut Amazon.
Given that Walmart already has relationships with freight forwarders from China and a bunch of brick and mortar stores that could double as warehouses, I wonder if they have considered this as a "side hustle."
Considering that this hinges on the cost of operations for the logistics service the interest in logistic based robotics is quite understandable.