Luis Von Anh is as you correctly state in your biography an innovator. Something that struck me when reading his biography and watching the videos was the importance of elegance. It is difficult enough to come up with a unique idea it is another thing all together to make the new idea elegant. I should preface that by elegance I am speaking in engineering terms where one is looking for a unique solution that is simple and effective.
Though Doulingo is quite a complicated program behind the scenes, to the user and someone looking to invest, it is simple to grasp and solves the problem. I was struck by how important it is to spend the time to simplify our ideas. Without an easy to grasp solution one is unlikely to be successful.