The Bing Wallpaper app has faced criticism after users reported that their desktop backgrounds were unexpectedly replaced with a fullscreen advertisement for the Harry Potter and Fantastic Beasts film collection. This promotional content has sparked frustration among users, who feel that it detracts from the app's aesthetic appeal. While the app has previously featured images related to popular movies and games, the explicit promotional messaging in the recent wallpaper has been particularly controversial. Users expressed a preference for non-promotional imagery that celebrates beloved franchises without overt advertising. The inclusion of such ads raises concerns about the app's future and its relationship with its user base.