My mental image is that people want to spin off AWS for society’s benefits because Amazon grew too big and abuses the integration. Amazon squarely resisting this idea seems uncontroversal.
Amazon is huge... but Walmart is truly massive... over double Amazon's size in just about every metric. They clearly have the resources to handle things on their own.
[1] https://poseidon01.ssrn.com/delivery.php?ID=0340721260780250...
[2] https://corporate.walmart.com/newsroom/company-facts#:~:text....
[3] https://corporate.walmart.com/askwalmart/in-which-countries-....
Walmart doesn't have the same capabilities. Being larger doesn't mean they can do it.
(6000 employees in 2018, per wikipedia)
The case of Amazon using internal market place data to guide their own product strategy has already been made over and over, so the precedent exists.