Microsoft's Bing Wallpaper app has faced backlash after users discovered that their daily wallpaper, typically featuring serene landscapes, was replaced by an advertisement for the Harry Potter and Fantastic Beasts film collection. This change has frustrated users, with some questioning the presence of ads and considering uninstalling the app. Social media reactions have been critical, with users expressing disappointment over the shift from nature images to promotional content. The choice of a Harry Potter-themed advertisement has also drawn ire due to the controversial views of series creator J.K. Rowling. This incident follows a history of Microsoft integrating advertisements into its Windows ecosystem, starting with ads in Windows 10 in 2016 and continuing with various promotional content in Windows 11.