PewDiePie, whose real name is Felix Kjellberg, took over the top spot on YouTube in 2013 and amassed nearly 100 million subscribers to his channel during his six-year reign.
He was overtaken by the Indian music label T-Series earlier this year, following a controversial battle that saw PewDiePie fans go to extreme lengths to try and get people to subscribe to the YouTube star.
Mr Kjellberg also made videos mocking T-Series, including two songs titled 'Bitch Lasagna' and 'Congratulations'.
One line from 'Bitch Lasagna' stated: "Your language sounds like it came from a mumble rap community."
While ostensibly a congratulatory song, his follow-up 'Congratulations' includes accusations of tax evasion and piracy against T-Series.
It also refers to legal action taken by the Indian corporation as a result of the first video.
"I got a letter in the post, hmmm, what is this? T-Series saying cease and desist," one line states. "Suck my f***ing Swedish meatballs."
Both songs are blocked for YouTube users in India following an injunction from Delhi's High Court.
The filing, uncovered by Business Insider, revealed that both channels came to a settlement over the videos, though no agreement was signed.
According to the Indian judge, the videos were "abusive, vulgar and also racist in nature".
A spokesperson for T-Series did not immediately respond to a request for comment.