Thanks for the response. IP anonymity is not as much of a concern as compared to facial anonymity.
I think that deep learning algorithms that can transpose one's expressions on another face exist, but they are not widely used and definitely not in commercial applications. The only case where it was done was last year I think when the russian services presented a pretender for an Aleksey Navalni's associate in a video chat with EU members of parliament.
Turn camera off, point it at your shadow or use some censoring/blurring software to cover your face?
Along the same lines, wearing a mask also protects identity. The only problem is that this is an additional step for someone who is already reluctant to talk to a professional.
Avatarify looks pretty neat too: https://www.youtube.com/watch?v=Q7LFDT-FRzs