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 seeing multiple reports of channels losing actual subscribers, including Patreon backers, as a result of this purge. And in alarmingly high numbers. Something doesn't add up here. One friend of mine has lost HALF his subscriber base.