If I remember correctly, Valve started doing this some time ago as an "insurance policy", when Microsoft spoke about locking down Windows (before they introduced Windows Store).
It is amazing to see how far Linux gaming has come since then. 10 years ago almost none of the big games worked, 5 years ago lots of games worked after fiddling with wine config, and now most of the games I have tried work out of the box after enabling Proton.
It is amazing to see how far Linux gaming has come since then. 10 years ago almost none of the big games worked, 5 years ago lots of games worked after fiddling with wine config, and now most of the games I have tried work out of the box after enabling Proton.
Imagine what will come in the next 5 to 10 years.