As much as it sounds like it would make sense, I haven't seen any hints that they are developing Proton for macOS. That seems like it would be evident from open

As much as it sounds like it would make sense, I haven't seen any hints that they are developing Proton for macOS. That seems like it would be evident from open source changes, if it was happening. I think Valve is reluctant to get any closer to Apple, or any large platform owner for that matter. They want to stay independent and own their own destiny. They even tried to get away from Microsoft with Steam Machines. It failed back then, but the Steam Deck is the continuation of that effort.