I'm not entirely sure, to be honest. If you look at the linked video, they state that it's oftentimes not in the best interest of the private equity group's moneymaking capabilities to announce that a channel has been sold out to them.

How that is in practice, I'm not sure, and I'm sure with some sleuthing it would be possible to find out at least some of it. But on the whole, I'm honestly not sure beyond that.