This video has X views but there's only Y people in the world?! Hacks?!. This meme is a popular fad in Pewd's videos. Also, this meme's origin started on YouTube when the popular YouTuber, PewDiePie, uploaded a video on hate comments set for spam titled: MEAN COMMENTS.

The video – which currently has 13,500,000+ views – had one comment posted (possibly as a troll) from a person by the name of "robert" Saying, "How can pewdiepie have 26 million subscribers while there are only 7-8 million people on earth?? fake accunts..?". Skip to 4:09 on the video below to see the moment.
This gained popularity..as of course Pewds is pretty popular. This lead to others commenting on Pewd's videos saying things like, "How can there be 301 views when there's only 67 ppl on Earth??! Illuminati?!"

However, it hasn't just spread to PewDiePie's videos, but others as well.