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!
Heads up users, A subscriber purge is imminent. Be sure to make a list of all channels you are subbed to in order to resubscribe when the YouTube algorithm inevitably unsubscribes you from channels YouTube doesn't like in order to damage those channels.