I personally handle my firewall via openwrt (firmware) on my router but a lot of people like software solutions for the OS such as Safing Portmaster (Windows / Linux) or Little Snitch (macOS)
There are also hardware solutions but buying a specific device for this use case is probably something you should work your way into if you decide a software solution doesn't cut it.
I was wondering when that repo showed up and all of a sudden there were 50k downloads of the windows version if this might happen.
The coderberg fork was linked directly to the main strawberry page where the source code is and it's pretty obvious the downloads were just the same as any subscriber executables.
I highly doubt the story that the person behind the fork was given binaries for testing. My guess is it was just a subscriber sharing their downloaded executables.
The whole malware argument the creator made is fear mongering.
Its odd he charges $7/month for subscribers on Patreon but its only $5 if you pay via Kofi.