That's going to be interesting for some, and especially those built on a house of cards.
...we’ll soon implement a new process to improve the accuracy of subscriber counts. It’s similar to existing ways we ensure that other site metrics, like views, are free of spam and abuse, and keep YouTube a fair playing field for everyone.
On June 16, we’re going to remove suspended accounts from all channels’ subscriber counts. This means some of you will notice a minor drop in your subscribers. To be clear, these are not active viewers, so you shouldn’t see any impact on your views or watch time.
Still wondering if it means that one of these days it will take less than three months for deleted accounts to drop off your Subscriber list-- where it is impossible to remove them yourself if the account no longer exists.