You've missed a total of four wars, two of them Muggle; the invention of the wireless radio; and not much else that we wizards had. It was the Muggles who made all of the leaps and bounds, while we stayed pretty much mired in the middle ages.
Glad we weren't the only ones. But it remains that while this network isn't open to the general public, it is still public to those who have access to it, and we must mind our manners and obey the law, Albus.