As a (unworthy, since I happen to use proprietary software accidentally) believer in Free Software, I tend to agree, but since that's unlikely to happen, I'd sa

As a (unworthy, since I happen to use proprietary software accidentally) believer in Free Software, I tend to agree, but since that's unlikely to happen, I'd say all security-related software should be at least fully auditable by end-user. That is, there must be either 1) some form of human-readable (i.e. unobfuscated) source code and means to validate the built binaries to match the provided sources or 2) means to easily decompile the binaries to a human-readable high-level language and study their behavior. 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.