You can use Moonlight or Steam Remote Play to stream the game from a powerful Windows PC to your Deck, bypassing the local anti-cheat restriction. (The Valve Game) Ricochet on Steam
The system is currently incompatible with SteamOS . Because it utilizes a kernel-level driver specifically designed for Windows, it prevents modern Call of Duty games from running on the Steam Deck's native operating system.
The Steam Deck offers a range of innovative features, including:
If you decide to install Windows on your Steam Deck to play Call of Duty, you must be aware of hardware-level nuances that can trigger RICOCHET's automated flags.
Ricochet: Infinity had a Linux build (often bundled with old Loki or Linux Game Publishing versions). This avoids Proton.