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!
It will get worse when Google+ shuts down fully in April, it got hacked again initially it was closing August 2019 but it is closing April 2019 because it got twice. We all know Google+ has a big role on YouTube.