Business Insider reports that PewDiePie boosted his monthly subscriber count by 700% over three months .
This is thanks to a massive campaign to stop another channel becoming the most popular YouTuber.
Bollywood music channel T-Series keeps coming close to knocking PewDiePie off the top spot.
However, a sustained campaign by the Swedish YouTuber's peers and fans has kept him number one.
PewDiePie gained more subscribers in four months in 2018 than all of 2017.