spoonmonkeyuk

For Apple at least, they have no motive to gain market share on web-based maps, for them mapping is a means to an end rather than a product line in its own right. Maps on mobile are an expected feature right now, and having their own solution meant more flexibility and control, and less dependence on Google.

Why not? Because of liability to law suits for breach of the terms of service or copyright violation. Third parties have been sued for scraping in the past.

The app cannot function as you'd expect a screen saver to do: it won't start running after a period of inactivity. That is outside the scope of functionality available to apps.

As such, yeah the name is a little misleading.