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It is all dependant on the uploader. The uploaded of the video can set types of ads. The small 5 seconds ones gives less revenue, but is less of an irritation for the viewer which should lead to more subscribers. And then the long ones that gives more revenue but could damage the reputation of your channel. You can set ratio's. In Terms of the genre of the ad it is in the hands of youtube to select which ads will pop up for the user. Youtube uses its parent company (Google) to find out which genres you are interested in to then create "personalized" ads. Seeing as Google owns most of the Internet you can't really stay on the web without feeding some tasty info to them in some way or the other. Nothing is free you are just paying for indirectly through being allowed to influence your consumeristic behaviour. Hope that made you all fell better. Cheers