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He and his team figured out the YouTube algorithm. He then took the money and spend it back on production. Because there are no guidelines or regulations of YouTube videos production, he is able to use any ethical or non-ethical tactics. His videos is treated like a high budget movie where every second count.
Companies sees his money and everyone want to get piece of the cacke so he is more visible to demographic outside of his target audience.
He also invests a lot in localisation which makes his videos appealing to non western audiences.