Amazon makes a huge chuck of its revenue from AWS and IT Cloud services. A lot of their sales are from vendors who use Amazon as a storefront. Amazon Prime is used to buy NFL football games and cheap/freee movies/music.
In other words, Amazon is not just or even primarily, an online Walmart, it is its own thing, and gets ots money from many sources.
“Amazon Web Services, Inc. (AWS) is a subsidiary of Amazon that provides on-demand cloud computing platforms and APIs to individuals, companies, and governments, on a metered, pay-as-you-go basis. Clients will often use this in combination with autoscaling (a process that allows a client to use more computing in times of high application usage, and then scale down to reduce costs when there is less traffic). These cloud computing web services provide various services related to networking, compute, storage, middleware, IoT and other processing capacity, as well as software tools via AWS server farms. This frees clients from managing, scaling, and patching hardware and operating systems. One of the foundational services is Amazon Elastic Compute Cloud (EC2), which allows users to have at their disposal a virtual cluster of computers, with extremely high availability”
“Revenue US$80 billion (2022)”
“Operating income US$22.8 billion (2022)”
https://en.wikipedia.org/wiki/Amazon_Web_Services