The system that Ben and Elvira discussed wasn't some omniscient, world-spanning network. It was more like a localized magical intranet, only functioning within areas covered by Elvira's mana circuit arrays. Even then, the information it could transmit was limited.
The funny thing about magic was this: while mages could teleport physical objects through connected circles without much hassle, transmitting information was a whole different story.
Messages needed to be layered with intense obfuscation, coded, scrambled, sealed, then decoded again on the receiving end. Just to send a paragraph of text, the system often required the magical equivalent of ninety-nine pages of encryption runes.
Ben had asked her once, "Why bother? Why make it that complicated?"
Elvira's answer had been simple: "Because my beloved, unlike on your old world, people here can see the signal. Mages can directly read the ambient mana.