Only by luck
Glad my DVR is not network connected, though given the default install was really really insistent on network connectivity I can see why lots of people set it up (all a bit pointless for me as I dont do Netflix and various other services it claimed to support & why would I want Freeview plus over my internet connection, the whole point of a DVR is so I can record stuff & thus not miss it!) - as Netflix and other services are v. popular with many people, no surprise so many DVRs are connected (and that for those users the connectivity is thus potentially useful).
Who knows, If I was a Netflix user I might even have been tempted to set up networking