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!
How will you identify spam accounts? A sub farm from China uses a different phone for every account. How can you make sure to not remove actual subscribers?