Might need more testing
GlassWire Network Security Monitor & Firewall Tool
We created GlassWire to help everyday users protect their computers and privacy by monitoring their network activity . The security, data, and privacy of our GlassWire users is our priority. We hope HackerOne will help security researchers report GlassWire desktop software vulnerabilities to us.
Reporting a vulnerability in the GlassWire desktop software
We will try to review all reported vulnerabilities within 10 business days to see if they qualify for HackerOne recognition. Vulnerability reports require a proof of concept and detailed information on how the vulnerability can cause GlassWire to be misused.
That is, one of the first things this GlassWire app did is connection to its home server. It openly admitted that itself, but nonetheless, why it did so and what kind of data (~200+ KiB, that's a fair amount that probably exceeds any analytic and update-checking needs) were transferred — I have no idea and I'm too lazy to figure out.
Thanks for your feedback. We'll try to add more transparency. The calling home is for software updates and it shows up on the graph, and GlassWire can even block itself.