Valve is clean enough. They develop and support Proton. Their stance, and the working state of Proton is quite clear. They run the Deck Verified program, where

Valve is clean enough. They develop and support Proton. Their stance, and the working state of Proton is quite clear. They run the Deck Verified program, where they ascertain on how well the software from their store works on the deck, via Proton. In case you are wondering on how they go about this, you can learn here: https://partner.steamgames.com/doc/steamdeck/compat https://partner.steamgames.com/doc/steamdeck/compat