Side note: I wish the "killer app" for deepfakes hadn't been porn. The technology was impressive, but having such a scuzzy popular usecase made sharing it with others kind of fraught.
Porn was the killer app for online video streaming and secure online payments too, though. The Internet owes a lot to porn.
Sexual gratification is one of our most primal urges. Makes sense that it would be a driving factor in this, despite the strong taboo in some cultures.
what would the other use be? Manipulation of new and media?
TV/Cartoon mashups, AR 'stickers', plenty of silly entertainment possibities.