Because the capitalism isn’t flavored to your taste this week? I take it you would rather throw money at the corporations when they brand their products with hammer and sickle
Valve will be just as Capitalist when it ends. If you aren't okay with Capitalism for video games, or see it as a necessary evil while we live under Capitalism, you need to consume FOSS games and buy straight from indie devs, essentially.
My point is that this isn't Valve "at their worst," it's the exact same Valve. Valve has always been Capitalist, and always has functioned in a Capitalist manner. Valve taking a brand new stance, like "fuck trans people," would be Valve at their worst.
Basically, there's no difference in how much Valve supports Capitalism between last week and now, but if Valve changed their stance for the worse then that would be cause for a shift in consumer sentiment.
Piracy also works quite well. But my stance isn't capitalism bad (it is bad though) but rather that I don't want to support marketing that is politicised.