Сильно понятнее не стало, но говорят что утечка исходных кодов Snapchat связана как-то с майским обновлением iOS и дырой в нем.
sensorstechforum.com/snapchat-so
Snapchat Source Code Leak on GitHub Caused by Bad iOS App Update
The source code belongs to the frontend of Snapchat for iOS, and has been confirmed as genuine by Snap Inc. The leak was possible due to an iOS update.