Google photos has been "searchable by name" for years now. Tell it the name of a face in one photo and it can go search (pretty successfully) through all your photos for other photos containing that person. And, of course, once told, it never forgets.
Is it still a service when you are the product? Or, are you being served? https://en.wikipedia.org/wiki/To_Serve_Man_(The_Twilight_Zone)