Amazon wants to spread this to more than just their stores. It's a mild problem now but most things are when new tech is introduced. Accessibility doesn't matter when only a few sites are on the web but becomes critical when the web is the default way to access information.
The Amazon Go I used to visit was maybe 200 square feet in size but had 4-5 people stocking and moving things around. And apparently there are others in the back assisting the cameras and making sandwiches and whatnot.