That is a good question - I don't know enough about the algorithm to really say - plus they keep it secret - but the algorithm must favour this type of content - otherwise it would not get millions of views the way it does - YouTube would add flag words that would slow the growth of the video at a view count and then let it fade away - I've seen that happen myself over and over again - but there must be some favouritism to these videos - other than that, don't really know :/