Ann: Trading Halt, page-601

It would depend on the way Big have their page set up, and what info they have agreed with YT to be fed back in. If its just a basic channel there may be no ad revenue fees back to YT

Advertising revenue from YT is be on a metric of people seeing it - they factor this out to a cost per thousand, so there's not a fixed revenue position as such.

For example, there is a channel called Maker Studios that is actually owned by Disney - when we place ads through Maker Studios there is a fixed (though sometimes negotiable...) Cost per thousand placed against activity - we say we have $x, they then guarantee a number of views / eyeballs. Within that cost (let's say its a $50 cost per thousand), there will be a fixed amount - something like $2 of that $50 - which goes straight back to YT.