> If free speech is a right worth protecting from the government, it’s worth protecting against equally powerful corporations.

The right of free speech is that you can say what you want without violent repercussions, such as fines, prison time, or capital punishment. Corporations and individuals already aren't allowed to do any of that, so no additional protection is needed. Governments are singled out specifically because they do not follow the same rules as everyone else—asserting that violence is a "legitimate" means of achieving arbitrary goals.