Abuse survivor here. I'm in my mid 30s now, male. I've not seen or heard from my parents/step-parents since I was fifteen years old. One of the best things I ever did in life.
Blackmail was not involved here, as far as I can tell. I never read anything about that. She never threatened to release the video; she just did it. I would bet sacks full of money that she never let anyone else know about that video, out of fear of being abused further. It doesn't even make sense that she would try to use it as a control mechanism against him. Even if she did,.... uh... good for her.
Note in the articles how the farther took back a car, thus depriving her of the ability to get around. It was never a gift to her. It was a tool to use as control, and when he wanted to control her further, he yanked the chain. This is a twenty year old we are talking about here, not a child. Even in adulthood, he treats his daughter as something that needs to be controlled.
This guy will lose friends, respect, his job, and his entire career. I'd say that's pretty fair. I don't have any sympathy for him and very little for the mother.
As for the feds, they should not be involved in any way, no duh.
As for charges, unfortunately, she sat on this too long. Fear can really paralyze and control you. Again, no duh.