https://www.cnbc.com/2017/08/11/walmart-is-quietly-growing-its-online-advertising-business.html

Wal-Mart has been quietly building up its online advertising business, opening up a new revenue channel for the retail giant.

According to KeyBanc's Ed Yruma, Wal-Mart's website has started to show banner ads by third-party sellers more frequently, with links to product pages or vendor websites. Historically, Wal-Mart's online ads have highlighted its own products or discounts, Yruma said.