I agree with the observations of the previous answer. Additionally, market strategy determines the app's sustainability. Market strategy enables the app to build Market share, revenue and become viable to acquisition.
1. If an app targets a specific set of pain points
2. Provides easy use
3. Provides a satisfactory user experience
4. Has a unique strategy for acquiring paid users
5. Can grow market share - has global accessibility
6. Is suitable for acquisition
Leading early stage companies to profitability and prepping them for acquisition is what I do.