What is the effect of this? Apart from some security through obscurity measures that might now be useless, what could the worst negative effect of this be? I can't imagine it could hurt Snapchat.
Same potential damages from source code leaks : revealing secret projects in roadmap, security or privacy malpractices, lack or respect of SW licenses.
Yeah definitely the SW licenses as SnapChat is mainly US so there probably won't be any real repercussions related to privacy.
Don't these guys have a super-secretive work culture? Like, you can't even ask what your colleague from another building is currently working on. I'd imagine they'd be very displeased with this leak, and somebody probably got fired.
You can probably scavenge code looking for possible leaks and attack vectors. Plus (I didn't check the code) you can find some tokens/salts/whatever used internally, or new features already there and hidden, a/b tests, etc....