Saw the announcement[0] posted by nitrohorse[1] yesterday and was surprised it didn't get any traction.

A cursory search turned up an article from last year with a lot more detail on the project[2].

[0] Introducing Guardian Firewall for iOS https://guardianapp.com/blog/2019/06/introducing-guardian-fi...

[1] https://news.ycombinator.com/item?id=20162482

[2] A new ‘smart firewall’ iPhone app promises to put your privacy before profits https://techcrunch.com/2018/10/24/smart-firewall-guardian-ip...