YouTube has recently updated their algorithm and they are using a Quick Search Technique to find and eliminate those inactive Accounts.
Twitter did this same thing few months ago, where they removed more than 10 million Inactive Accounts and made a Fake-Free Twitter Platform.
But are they doing Well?
No, YouTube has probably made a mistake in their new algorithm. Many users are facing a glitch of being Unsubscribed from Different Channels. An Indian YouTuber Mumbiker Nikhil was having 1.6 Millions of Growing Subscribers and within two days they came down to 1.5, then 1.4 and now He has 1.3 Million Subscribers.
Although he reported the problem to the YouTube and also updated his fans to Subscribe him again, but still his subscribers are getting deducted for no reason.
Similarly, this same thing happened to many of the YouTubers in the past few days which includes the New, Mediocre and Professional YouTubers.
YouTube is working to fix the bugs as soon as possible. Within one or two days, this problem won’t occur anymore, although the Subscribers won’t Increase automatically to the one who lost it, as YouTube does not allows auto Subscription of any Accounts.