The point is the government can't arbitrarily take away your medium of communication you legally own and use. Barring random specific issues (such as noise ordinances), if you own a megaphone (metaphorical or not) you can use it to spread your speech. If people could only exercise free speech by whispering quietly to themselves then it may as well not exist. You could start by reading wikipedia about freedom of the press.
That, I already understand. What I'm asking about is the narrower definition of "the press" in that historical context, because the usage nowadays is much broader.
