There isn't anything wrong with having a trademark that is a common word (after all you can't always just make up words all the time or every product will sound ridiculous). Apple, Office, Windows, etc. are all fine, and should be defendable. The problem is that Tim goes after things purely as a basis to make money, as opposed to just defending his trademark. He tries to claim everything that is made by other people as part of his doing (under license of his trademark), just to make a bigger case for the next instance. He really is abusing it. Inherently, there's nothing wrong with trademarking a common word and defending it.