Valve’s new portable device is a hit, but it doesn’t seem to meet all the requirements for playing Destiny 2. Bungie has updated the help page for Destiny 2, and it includes a warning to anyone thinking of entering the shooter with a Steam Deck.
Steam Deck and Destiny 2
Destiny 2 is not supported for play on the Steam Deck or on any system utilizing Steam Play’s Proton unless Windows is installed and running. Players who attempt to launch Destiny 2 on the Steam Deck through SteamOS or Proton will be unable to enter the game and will be returned to their game library after a short time.
Players who are not accessing Destiny 2 through Windows and attempt to bypass the SteamOS/Proton incompatibility will be met with a game ban.
Many have commented on this on the Destiny 2 subreddit. It’s rumored this could relate to the game’s anti-cheat system. Bungie employed BattlEye in Destiny 2 to prevent hacking or cheating in the game. Although the system has been integrated into Steam, it’s theorized that Bungie is not satisfied with how Proton’s compatibility layer functions with the system. Players who own a Steam Deck need to avoid trying to enter the game from it or risk being banned.
Source: GamesRadar