Where's the demand for such a tool? If you have the experience and understanding to build a good back-end with a no-code tool, then you're already at a point where working with code isn't a problem for you.
Usually to streamline certain oft-repeated tasks. The audience for such tools is not people who dont know how to build them, it's people who know how to build them but dont have time, which is very common condition for people working in computers.