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!
And what exactly counts as a spam subsctiption?.. I'm asking in the sense, that I'll be unsubscribed from some of my favorite content creators and wont get notifications about new videos.