[gavaw]

Correct me if wrong but you don't need to request network permissions to be able to make outside connections.

Almost all apps make outside connections and it would make no sense to prompt the user for that.

[vanous]

If you don't declare network access in the app manifest, your app cannot make a network connection. If you declare network access, app can make a network call and user confirmation is not required. It is thus very easy to check for apps that are truly offline.