The fact that the hacker(s) removed the personal info from the source code shows that they've had this code for quite a while. That means that Twitch/faceberg/etc were hacked ages ago and they don't know who did it. Now those that want to make backdoors for Twitch can now make them quite easily. And it's going to take forever for Twitch's programmers to fix the zero days in the code. Good luck to the admins trying to find out how they were hacked.