Does Opera One Work Across All Operating Systems?

Yes, Opera works across all operating systems, including MacOS, Windows, and even Linux.

Is Opera One Built on Chromium?

Opera, like Arc and Chrome is also built atop of Google's open-source Chromium engine.

How Does Opera Make Money?

Not unlike most browser competitors in the space, Opera gets paid by Google (primarily) by directing people to the search engine (and Google making ad revenue from that traffic). They actually make the majority of their money by selling advertising, with Google Search payment coming in at slightly less than that.

Is Opera Private and Safe?

Opera as a browser is relatively safe, although they've gotten into some hot water surrounding their ownership by Kunlun Tech, a Chinese company. What's more is that they make most of their money from advertising (more even than what Google pays them for sending search traffic—unlike other browsers who also make their main revenue from Google: Safari, Brave, and even Firefox), so it's quite clear that they are collecting and selling user data.