The comment bots which had taken over YouTube, is creating spam and some of these bots are no joke, they hack accounts.
Farming subscribers using bots is against the community guidelines and should be stopped.
These bots are giving 'positive opinions' on your video, tricking you into subscribing to them. There, some of the bots hack YT accounts and turn those into bots, spreading the comment botting fast. Other bots farm subscribers without sub botting (but their method is illegal, it involves bots), which is a part of an unknown scheme.
Whatever they are doing, its against the rules to use bots, spam comments and hack. They also impersonate popular youtubers (such as MrBeast) and the way they gain subscribers is unfair and illegal. 
If you want YouTube to be a safe community without hackers and vice versa, sign this petition now! Terminate the bots! (Block those bots and report them too!