Chromium isn’t available on some OS (most notably iOS for now because Apple sucks shit)
Also last I checked, which was recently, Chromium doesn’t come with adblock built-in. In fact doesn’t basic vanilla chromium not allow addons at all?
So a Brave fork would be all the good parts of it (the ad blocking chiefly) but minus the bad parts like the crypto BS. Maybe that’s an entirely different project, I don’t know. I just use Firefox+ubo on desktop. Doesn’t matter that much to me if someone does it or not, but I was always confused why privacy-centric people seemed to love the crypto browser.