I don't think this is true. The apple ad video on which this was based has been floating around on google video and youtube for years, and they never took any action.
You can fully explain apple's lack of action very easily: this is a commercial, not a movie. They want as many people to view it as possible. They get free publicity every time NBC news (or any other) shows it on the air and says it was based on an Apple ad. The original apple ad is also getting huge numbers of hits now.
From apple's point of view, what's not to love about this situation?
No nefarious explanation is needed: apple makes out like a bandit. They would not want to discourage this kind of activity in any way.
A great deal. By allowing this extraordinary use of its ad, its logo, and the clip of the female athlete Apple puts itself in the position of being subject to serious retaliation by the Clinton forces, both in the form of potential individual boycotts and, far worse, the retaliatory denial of government contracts if, God forbid, the Witch should be elected President. It also potentially exposes itself to FEC charges if the Witch's operatives accuse it of making an in kind contribution to the Obama campaign.