Not quite the same as Vtuber avatars, but what you said about their software makes me think (hope) you might be able to answer a question I was wondering about the other day: is any software/models good enough yet to be able to replace the face of someone talking into a webcam with a different, photorealistic face - either that of a different existing person, or an entirely fictitious face - in real time, such that it could be used to pretend to be a different person on a live video call? Or, if not real time, how about for non-live videos, is there a tool that can do it well enough to be convincing without needing any manual editing?
And if the answer is no, how far away might it be?
(I'd be curious to play with it myself if such a thing exists and is publicly available, but the main reason I'd like to know is to keep an eye on how soon we might see faked video calls joining faked voice phone calls in the toolbox of financial scammers.)