While that answer is not complete, it's also definitely not "no answer". I agree that there should probably be some company associated, but as MVP from single developer, do you expect to get his full address too?
why are you being so hard on a solo entrepreneur? I'm sure making a sleek service like that takes plenty of all nighters. He is even offering a free service costing him server and costs to make API calls to an AI service. If you're concerned about privacy, be more supportive, help him sort this out or at least give him some time to sort it out. Don't assume he's being dodgy. Everyone has to start somewhere.