After recently switching over from Easy Anti-Cheat to BattlEye for DUCKSIDE, tinyBuild have confirmed they're now looking to enable it for players on Steam Deck / Linux with Proton.
Read the full article here: https://www.gamingonlinux.com/2025/04/duckside-from-tinybuild-may-get-battleye-anti-cheat-enabled-for-steam-deck-linux/