Then what isn't 'petty'? It's not like it's zero-sum, there are also people working on using AI for recognizing cancer cells on medical imaging, or to manage climate change risk. And if we don't try, we'll never know what is 'petty' and what is useful. And also, we can learn a lot from the 'exercise' we get in developing small-scale applications of machine learning, which can then be applied later to more 'worthy' applications.