It's funny because I worked in that repository for a few years, and routinely built a custom "shell" (what Chromecast is) and when this guy suggested Brave my thought was... eh, yeah, sure, but I could also just roll my own or just run stock chromium :-)
I personally like that Firefox isn't based on webkit/blink.
Perhaps you haven't heard of Chromium. If so, that may be because Chromium doesn't spend as much on marketing as Brave.
https://www.chromium.org/getting-involved/download-chromium/