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by midnight_city 5217 days ago
From Cryptose's README.md:

  License
  -------

  This game is licensed under the GNU General Public License (see gpl.txt). As the copyright owner, I hereby give anyone permission to re-license my GPL code under a non-GPL license for the purpose of distributing it in the iOS App Store or the Android Market.
1 comments

This is not what you think it is. This is necessary because GPL is incompatible with App Store. (It doesn't seem to be rigorously enforced, but search for "GNU Go App Store".)
Go was GPLv3, which is clearly incompatible with the App Store ToS. The situation with GPLv2 is considerably more ambiguous.