That app is probably a lot more than an app. It’s probably also servers running on the Internet that the app needs to talk to. And that server component needs to manage a lot of data with some kind of database. And there needs to be a communication protocol for the app to talk to the server. And it needs to be secure, and maintain the privacy of all the users’ data. And it needs to be reliable, with backup servers, and data backups.
In other words, something that is just an app from the user’s perspective is probably a giant complicated system with computers running on the Internet behind the scenes that make the app work. Big complicated things take a lot of work to design, build, test, operate, and maintain.
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