Opera is Chinese owned and backed by the CCP, plus it's Closed Source and spies on you. Arc is a MacOS chromium browser firstly.. Besides, like I said, hard forking a google chromium browser isn't going to go down well, at all. Cries of "obsolete", and "unsecure" will abound. They'd also still be reliant on google web extensions.. Rooting out google from browsers today would mean breaking up all their internet related avenues. Ads, fonts, analytics, tag manager, web rtc, webgl, web extensions, web assembly, web components, widewine, safe browsing, irregexp, geo location, Skia, search, android, and chromium.