The source really isn't the problem. An app developer can put a link on the app page that has the source. I think the problems stem more from things like:

    6. Each time you redistribute the Program (or any work based on the Program),
    the recipient automatically receives a license from the original licensor to
    copy, distribute or modify the Program subject to these terms and conditions.
    You may not impose any further restrictions on the recipients' exercise of
    the rights granted herein. You are not responsible for enforcing compliance
    by third parties to this License.

Apple definitely imposes "further restrictions on the recipients' exercise of the rights granted". I can't copy the game from my iPhone to my friend's iPhone. I can't even use a copy of the source without paying Apple more money for a dev license.