So... if the moderators here decided to remove anything you said in favor of Apple, you would not call that "censorship" simply because this forum is not a country?
In that event the moderators would be "moderating." If they had the power to prevent me from posting pro-Apple comments in ANY public forum, then they would be "censoring" me.
If Arn deleted one of my posts, I could choose to post my comments on any one of the hundreds of tech boards, or start my own blog and rant away on it. MacRumors would have to make a decision as to whether or not reduced traffic to their site (and the corresponding drop in ad revenue from views and click-thrus) as a result of a heavy-handed moderation posture would be worth the removal of what they would consider objectionable material. Again, a business decision.
Censorship is censorship, no matter who does it, or for a good or bad reason.
Censorship is censorship when a government or similarly powerful totalitarian entity eliminates or attempts to eliminate voices of descent or prevents its people from obtaining unmanaged and unfiltered information from unofficial sources.
Apple, for example, is infamous for removing messages from its forums that make it look bad. When the price dropped on the first iPhone, Apple deleted literally thousands of angry posts before Jobs caved in under the pressure. That was censorship, pure and simple, trying to stop public opinion.
Nope. That was a calculated business decision to prevent persons from using a communication forum Apple hosts and maintains for purposes contrary to the company's intentions. Apple did not call Al Gore (Inventor of the Internet) and say "Gee, Al, can you completely shutdown all worldwide dissenting posts regarding the iPhone price drop? Thanks, man."
The reversal of that decision was another business decision--that the bad PR from pulling the posts was potentially more damaging than the posts themselves.
Apple owns the servers hosting their forums and the software that runs them. They could moderate out every third guy named Phil if they wanted to. If whiners want to libel Apple, they have thousands of other options.
Despite your hyperbole, to be "censorship" it is not required that the "censor" is a government. No one is saying this is a First Amendment issue (the First Amendment, of course, applying only to government censors). While most censorship occurs by governments (because governments are uniquely situated to act as censors due to their ability to leverage legal authority to do so), censorship also is committed by media companies and publishers, and others in position to act as censors.
As far as media conglomerates and publishers doing the same thing, they, too, are for-profit entities in a free market. If Fox News won't run your story, CNN might, NPR might, and it could run night and day on MSNBC and still no one would see it! If your steamy new bodice-ripper paperback is too hot for Harlequin, I bet Larry Flint will get 'er published for you. Or just publish it yourself at Lulu.com. In both examples, the word you're looking for is "editing", not "censorship."
Editing content and moderating discussions--performed by private parties (individuals and/or corporations) is NOT censorship. It may be a dumb idea and counterproductive when taken too far, I'll grant you, and I'm sure if it's YOUR app that gets the boot, YOUR post that gets deleted, or YOUR article that hits the editing room floor, it sure "feels" like censorship.
But at Wordpress you can devise your own nasty blog in five minutes and shout your message to the world. Hooray! No censorship for you. Sorry.