There’s a documentary on Netflix called Lover Stalker Killer where a woman named Shanna "Liz" Golyar hid her IP address and masked her identity while stalking and impersonating Cari F. by using a combination of Virtual Private Networks (VPNs), proxy services, and specialized communications apps.
“The suspect used VPNs, proxies, and apps to schedule texts and hide their IP address. The successful prosecution, owing to years of work by dedicated public servants in two states, relied heavily on digital evidence to prove a premeditated, no-body homicide.”
A digital forensic investigator named Anthony Kava wound up writing a program that helped to solve the murder. Fascinating and unsettling documentary. The investigator even did an AMA on Reddit.
When it comes to the ransom communications I think some apps like this may be being used, obviously along with VPNs by the person(s) that have NG. And I know they’re gonna find these people and get Nancy back one way or the other.