Valve hasn't sued anyone to give them a portion of their income forever. Valve also doesn't pursue anti consumer goals on daily basis. Not that it has never done anything wrong but it has done enough good to be on my good side as little as it means
Being publicly traded inherently means you need to show growth every 3 months or your shares are worthless. Cue the enshittification and squeezing pennies from every revenue stream possible.
That's the sole reason Valve hasn't gone down that path is its status in this regard.