>always something out-of-stock, which seemed implausible Maybe these services use dark stores, where they aren't running around your local supermarket picking

>always something out-of-stock, which seemed implausible Maybe these services use dark stores, where they aren't running around your local supermarket picking up items but have a private warehouse in the city. So lots of things are out of stock. https://en.wikipedia.org/wiki/Dark_store https://en.wikipedia.org/wiki/Dark_store