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!
INB4 all "problematic" channels lose three quarters of their subs "accidentally" and all those accounts suddenly find themselves subbed to channels they've never seen or heard of before...