Gamesindustry.biz:

Atari has reportedly been applying legal pressure to developers which it believes are infringing on its intellectual property rights, despite the developers affected claiming that attempts had been made on their part to reach an agreement.

Black Powder Games, developer of one of the games Atari asked Apple to remove from the App Store, cites a “special relationship” between Atari and Apple as why Apple has been so quick to remove titles that Atari says violate its IP.