If this happens, will it be a mass exodus to Linux/Mac? Or will people just live with it? The fact that the Steam Deck has shown great promise in playing games on Linux has made me reconsider Windows yet again.
It’s literally a fork of wine.
But from a practical perspective, you tell steam to start the game and it starts it, installing and using proton as necessary. If the developers haven’t configured it you have to first click a button in preferences that says “use proton” (paraphrased), but that’s it.
It depends, the Heroic games launcher works well for GOG and Epic, and I’ve heard good things about Lutris too. For other games with their own launcher, you may have to follow certain instructions to get them to run.
Games like valorant are broken due to anticheat, but it’s basically malware and I wouldn’t install it anyway.