Subscriber Bombing

1. An act of user creating multiple and even more alt accounts just for the purpose to subscribe to themselves and other YouTubers.
2. A type of campaign encouraging users to subscribe to the campaign creator's YouTube channel or other YouTubers.

Subscriber Bombing campaigns allegedly existed since late-2006. PewDiePie VS T-Series was a prime example of a dismantled long-term Subscriber Bombing event from 2018 until 2019.