Michael
I Love YTtalk
I have two buddies who have motorcycle channels that were with BBTV and they both successfully left early. The money that they were generating with BBTV was fractions of fractions less than with Adsense. They contacted support and told them that they would like to be released. They then got to the point where they started public ally reaching out to them (twitter, etc). Started making snarky comments and tagging them in it. They then sent them a message saying that they will be making a video about how bad this network is and exposing their experience unless they were let go. They both got out of BBTV this way.
One had around 30k subs at the time and the other had around 50k.
TL;DR - Gotta threaten them even though that's not the moral thing to do since you signed a contract that you willingly agreed to.
I cant say I agree with people doing that, it's like harassing them into submission because of something you regret doing.