Ethical question why are Closed systems wrong?

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http://androidforums.com – Hi, I have an assignment from school and I have to look for arguments that proves that Closed Systems are wrong in an ethical way. He knows there aren't any strong arguments he just want me to research a little. The teacher said that I had to look into Richard Stallman but I couldn't find any strong arguments from him. So the question is what makes Closed Systems Morally wrong if there are any. For example IOS from Apple. I just need a couple simple arguments to show my teacher. I hope you guys can help. Thanks in advance! (General)