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!
Can you send a notification/email to the channels that are removed of the channels they've been removed from? That'll cut down on the amount of accidental removals. Just a simple automated "you've been suspended from [youtuber], [youtuber], and [youtuber] should suffice