As a part of a pro movie making suite like AfterEffects or DaVinci Resolve - you can take somebody else to act in a scene and then replace with physique of your

As a part of a pro movie making suite like AfterEffects or DaVinci Resolve - you can take somebody else to act in a scene and then replace with physique of your chosen actor, e.g. you do stunts, your actor can't appear at a given geographic location at a given time, somebody had a facial injury/scars you want to get rid of etc. Plenty of valid uses. Then you could e.g. do a render in Blender and replace "avatars" with real human faces, avoiding "uncanny valley" in your animation. Travel industry can have uses as well - these days many places offer video recordings of their clients doing some dangerous activity; for those that can't do them yet still want the video they could offer pre-baked scenes where taking a selfie could kill somebody and then replace their face/body with some green screen footage of their client using this app and some pose estimator/body switcher. Or just show you how much would you enjoy some beach property in some hot location with a video featuring you etc. This would make it useful for custom ads featuring you as well.