Once your data is out there it's too late. If the hypothetical country you live in - where freedom & due process is respected - suddenly has an authoritarian change of direction, you're done.
It's my understanding that, organically or under external influences, many democratic countries in EU are at the emerging risk of going full fascists. I see that in France, Le Pen & friends don't hide the fact that they'd make a new constitution.
Richest guy in the world has vowed to use his propaganda power to make this happen for the sake of cancelling the EU, fun times
I fail to see how this particular "anime girl" and the potential for clients seeing it, could make you think that's a fair request. That seems extremely ridiculous to me.
Contrary to text and the big piles of "liberated" data hanging around for anyone looking hard enough to grab, the training data for video seems to be harder to access for opensource / research / individuals. Google has Youtube, OpenAI can pay whatever fee any proprietary data bank requires. There's a moat right there that I can't see how to overcome.