If we are being fair, they are still reasonably fair to users. Open source gaming is not a reality.
They don’t force you to use Steam, but still work on Proton as Open Source. They don’t lock down their hardware.
What I’m trying to say is, while Valve is not perfect, it’s much better than any big tech alternative.
Comparing source code sizes is completely meaningless. Rust projects are usually smaller with far more granular dependencies.