Extremist as defined by who? Valve lets the customer decide what is too extreme for them, which is how it should be.
I think is best also in your interest, as consumer (and human being, if you aren't Zuckeberg or Bezos) if companies are called accountable for the crap they spread just to make investor happy.
You may like Valve for their way of business, but the law doesn't work per persona: what it allow is a allowed to everyone (generally and depending if you're in a theocracy, oligarcy etc.)
There are companies that can operate control by using the money they get from billion of customers, and other companies that prefer to use the money the take from billion of customers to teach citizens how unfair the governments are.
Those who are manipulated in favor of big corps are generally poorly educated individuals, so you can have huge number of that people, which translate in both social, economical and political power.
The point is not Valve, which me or you can respect and enjoy as company, the problem is that laws affect everyone. If the laws favor predatory companies, Valve has either adapt to be predator or being extinguished.