as if newell is the guy doing all the work

He's the one who makes all the decisions. That's what matters here.

proton and steamos would be nowhere today without the decades of work by the WINE/DXVK contributors

And Proton wouldn't exist at all without Valve.

all valve did was add their proprietary client on top of that

That's completely false.

that work was done by valve employees and contributors, not the billionaire

The billionaire is the one who told them to do it.