Most app ideas die the expensive way. The founder pays an agency or spends a year learning to build, ships the app, and then discovers the market's true opinion: silence. The tragedy is that the silence was knowable in advance, for about one percent of the cost.
Source: [Dev.to](https://dev.to/assindo/how-to-validate-an-app-idea-before-building-it-the-cheap-honest-way-51f6)