$i13n7 tested around with the Windows 10 Firewall Control and like every small application phones home to Microsoft, e.g. the image viewer. The traffic is all encrypted though, so that would take some time to investigate what's actually send over the network.
He took some good portion of time and nerves to make up this block list, so Windows keeps working and same time can't phone home so much. Windows 10 is probably no good choice for privacy geeks. When somebody wants the firewall rules, he would probably deliver (aka just ask).