I don't think that zero-day is really an argument, given that the vast majority of users are on Chromium. If there is a zero-day on Chromium, most people have it.
> At the end of the day, the engine of the major browser engines is open-source anyway.
Open source is not enough. The question is: who controls it? AOSP is open source, Chromium is open source. But Google controls both. It means that Google can push for what is good for Google... even if it is bad for the user. E.g. preventing users from blocking ads. Not that it does not have to be with evil purposes (though Google has been shown to be evil enough already): it's enough for Google not to care about something for it to impact Chromium/AOSP.
That's the whole point of competition: you want the users to have choice, so that it pushes the companies towards building a better product. Monopolies never serve the users.
Now you say: "ok but it's open source, so if you're not happy you can fork away!" -> which precisely brings us to two browsers, like now with Chromium and Firefox.
> At the end of the day, the engine of the major browser engines is open-source anyway.
Open source is not enough. The question is: who controls it? AOSP is open source, Chromium is open source. But Google controls both. It means that Google can push for what is good for Google... even if it is bad for the user. E.g. preventing users from blocking ads. Not that it does not have to be with evil purposes (though Google has been shown to be evil enough already): it's enough for Google not to care about something for it to impact Chromium/AOSP.
That's the whole point of competition: you want the users to have choice, so that it pushes the companies towards building a better product. Monopolies never serve the users.
Now you say: "ok but it's open source, so if you're not happy you can fork away!" -> which precisely brings us to two browsers, like now with Chromium and Firefox.