True, there is currently no app or web service that can do all the work of getting you a job, or getting you a girlfriend, or whatever, from start to finish, but that doesn't mean it's impossible. It only means that particular app doesn't exist yet. Whoever cracks a nut like that can name their own price.
What would it mean if such an app existed? Would you be employing the app? Dating the app? Where's the person when the machine does all the work?
(This assumes that we don't have a dystopian future like in Terminator or The Matrix where the machines take over, which is not a given. But then, if we did, whoever wrote that app would likely be too busy saving the world from their creation to name their own price.)