The problem is how apps are bought on mobile now.

With PC applications, you’d buy a specific version and you would maybe get updates for a year. Then the developer would release an update and you would decide whether it was worth buying the update for the new enhancements. If it wasn’t then you’d stick with the old version until the next new version and make the choice again. This way the developer gets paid regularly by new and existing users if they produce a good app.

On mobile, you buy an app and expect to get updates for the life of the app. The developer is expected to keep producing updates whether the app is complete or not otherwise their app is labelled as dead. They only get paid by new users.

That second model is simply not sustainable from the developer’s point of view for any reasonably sized app so they need to think of ways to make it work. There are only two options which are ads and subscriptions and people don’t like either.

Of course, PC apps are also moving to subscriptions to remove the option that you used to have to not pay them for a year or two if they’re not providing good enough updates.