3/4 of those people have been continuously subscribed to you without interruption. 1/4 was affected by the bug that I acknowledged, which was resolved 2 weeks ago.
Why are we removing these old accounts that were previously included as subscribers? Good question. Well, they are old, inactive, inaccessible legacy accounts that we haven't yet gotten around to clearing out of our system until now. The numbers may look dramatic, but these people cannot watch videos. If your views or revenue are down recently, look for another explanation than this.