"personal carbon footprint" is a term invented by BP and is the single hack that derailed the environment discussion by making people personally responsible and removing the actual polluters from the discussion.
I think this is exactly the point that MrBeast is trying to make.
By being best YOUTUBE videos it means to focus on whatever appeals to the algorithm. It doesn't mean you are better informed, or better entertained, as long as the click-through-rate is great and the minutes people watch the video is maximized.
You could say the same thing is true for Xerox, for them the best doesn't necessary mean that they sell you the best most reliable copier, but the highest grossing product, with a guaranteed post-sale income.