I would argue that in this day and age the corporate Internet Gatekeepers (i.e. Google, Facebook, Twitter, Verizon, AT&T, Comcast etc.) have more leverage to threaten free speech and thought on a global scale than any government or organization has in history.
Sure, it's legal, but we all know just because something is legal doesn't mean it should be.
Humanity can't survive and evolve without freedom of thought. That is what's important here.