Valve has recently updated it's Steam Community Hub policies to prohibit the mentioning of non-Steam versions of games, this likely comes as competition increases in the largely stagnant PC gaming market from the likes of the Epic Games Store, and Xbox Game Pass for PC. This will mean that the Steam Community Hub will no longer include mentions to releases on other platforms. These new rules apply to both releases and DLC effectively stopping the promotion of other platforms on Steam.
Steam
In the game you ship via Steam, and in communications on Steam, you may only promote the Steam version and its availability via Steam, and not other distribution outlets. This applies both to full versions of your game and to content patches that change the existing version.
