https://www.bleepingcomputer.com/news/microsoft/microsoft-may-have-scrapped-windows-11s-dynamic-wallpapers-feature/

Microsoft has many good ideas for Windows 11 that often do not ship, and one of them was "Dynamic Wallpapers," which, as the name suggests, could have made the wallpaper dynamic, similar to third-party tools like Lively Wallpaper.

Dynamic wallpapers are wallpapers that move and animate automatically, creating a visually engaging and interactive experience on the desktop.