Thoughts on this topic:
My friend and I made an app on the app store that provides public safety. On first release, we only had a few hundred downloads within the first few months. We had a very low user retention and barely anyone used it. We re-released the app a few months later with better marketing techniques and more user friendly and now have over 50k downloads on it.
Would that be a good topic to answer " Describe a time when you experienced failure. "