> Because there are legitimate reasons why Facebook might need access to your network for streaming videos to a TV or similar uses cases.
If you want Facebook on your iPhone to call someone then Apple provides a Phone API.
If you want Facebook on your iPhone to stream to your TV then Apple should provide an Apple TV API for Facebook to use.
There is no reason whatsoever for Facebook to have any direct access to anything on your phone whether its your sensors, your microphone, your video, your network.
> If you want Facebook on your iPhone to stream to your TV then Apple should provide an Apple TV API for Facebook to use.
There is - AirPlay doesn't require local network access since it's an API apps can use. Un/fortunately, there are multiple competing standards like Chromecast (and other, manufacturer-specific casting standards) which require the app to do its own local network discovery to find available devices.
If you want Facebook on your iPhone to call someone then Apple provides a Phone API.
If you want Facebook on your iPhone to stream to your TV then Apple should provide an Apple TV API for Facebook to use.
There is no reason whatsoever for Facebook to have any direct access to anything on your phone whether its your sensors, your microphone, your video, your network.