I watched this video a while ago about what Amazon Go is a precursor for. In summary, if AWS is renting out server infrastructure for people, then you can imagine that Amazon can make the infrastructure to lease out Amazon Go to other stores. They first integrate it with Whole Foods, then as customers expect no more checkout areas, they will only go to Whole Foods because it's faster and maybe cheaper. Then because customers want it everywhere, Amazon could force other stores like Walmart and Target to integrate Amazon Go infrastructure to their stores, without Amazon directly competing with these stores, and make a ton of money leasing it out without spending money on building whole new stores. Of course, the acquisition could also be like nodes for warehousing and delivery, but both avenues are not mutually exclusive.