These can be benign, like re-creating a classic Star Trek episode.
They can also be used to assassinate someone’s character and reputation. They make it incredibly simple to create pornographic images and video about someone, based only on photos of their face.
I’m paranoid enough to wonder about whether when Apple added a side view for face unlock on their phones, some unscrupulous employee might have a way to sell those profiles to the highest bidder. Few people are as paranoid as me, but they haven’t had the same experiences I’ve had.
Here is a story about to how to detect them in real life: