Heads up, Creators: On Dec 13-14 you may see a noticeable decrease in your sub count as we remove spam subscriptions. If spam is removed, you'll see a YouTube Studio alert: https://goo.gl/qGDBvX This should help give you confidence that the subs you do have are real fans!
In other words, We don't like that the community supported PewDiePie as a means of fighting YouTube and we needed a way to justify deliberately attacking the user base