How in the dong does Pewdiepie's comment section work!?

[26FtW26]

He has 36 million subs but whenever I check one of his vids there's only like 7 comments with hundreds of upvotes.
http://vignette1.wikia.nocookie.net/freerealmswarriorcats/images/b/b7/3167760-jack_sparrow_wut_by_zackfair1219-d4117e5.jpg/revision/latest?cb=20131206041414

[_Tenflames_]

He deleted the comment thing on his videos and you can only comment on his pewdiepie forum kinda and i dont know how people can comment on his videos

Reason was because his subscriber we'rent like kinda talk about him instead of random stuff and spams