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!
I'm guessing it'll be another ham fisted approach to things from your end, YouTube, so many user subscriptions will get caught in the wake of this?