There was discussion here based on the contract presented to Zoe Keating. If you search her name here, there are a few articles that come up. Or, conversely, you could reach out to her and she may be willing to speak to her experience and understanding. (Note: I do not have any personal or professional relationship, I just followed her story somewhat as it was relevant to my status as an independent as well)

Zoe's seemed to be more about music specifically. As far as ads, she was going to be forced to have ads, not forced to remove them. http://zoekeating.tumblr.com/post/108898194009/what-should-i... Maybe this isn't the only thing she's written about YouTube though.