The only thing that make this not a treat to your regular folk it's the fact that needs a lot of images references to make the model, but imagine a politician or activist, they have a lot of images on the net; So this can take the fake news to another level. Yeah if this happens the news media and legal system, will probably not take shady videos seriously without verification (specially now, that the algorithm it's still is in the middle of the uncanny valley, so for the moment it's easy to recognize without experts need). But think about your friend, uncle or cousin that shares his "echo chamber" posts on facebook?
Or who knows, maybe I should't binge black mirror, and this only gets limited to porn and good uses. Like a new era for stunts in movies.