Digressing a bit, the link [2] feels off to me borderline scam-like. The URL points to "littlesnitchfirewall" which is not the official link to the well known macOS firewall application: https://obdev.at/products/littlesnitch, and this doesn't seem to be affiliated with Objective development in any way.

Also, the home page of that "blog" points to a 404 not found, and the footer of the blog says: "Official blog of NetworkMonitor — network monitoring and macOS privacy insights." and I can't seem to find any application made for the Mac called "NetworkMonitor".

My mistake, I may have fallen for an impostor site when trying to find an approachable source, unfortunately the edit-window has closed.

Originally the comment was Windows/Microsoft-centric, and then I thought I'd better broaden it so that nobody makes the mistake of thinking Apple is significantly safer.