Junk Store is an existing plugin for the Steam Deck homebrew launcher Decky Loader, and its purpose is simple: it allows installation of games from GOG and the Epic Games Store. It was recently announced that Junk Store would be releasing on Steam as standalone software, allowing players to play any and all games from competitors, with developer SDK Innovation saying it lets you "install and launch games directly in Game Mode without switching to Desktop or relying on external launchers."
That all sounds pretty convenient, but the big question is whether Valve would be cool with it: the nature of Junk Store would've made it the first product available on Steam that changes the functionality of Steam itself.
