99% of Mac users are installing Chrome or Firefox using Safari. They are objectively assessing it in a real-world test, and deciding that Safari lost. You're lucky there's no convenient way to uninstall Safari from the OS, the user telemetry would be a bloodbath.

Apple is a corporation too, and they have their own (quite sizable) financial interest in gimping the web as an alternative to native app distribution. Apple used to recognize this, and prioritized interoperability with OpenGL and OpenCL as a hedge against the web becoming the only cross-platform API that the Mac supported. The Apple of today has abandoned those interests and lost all pretenses of humility. They are equally as mask-off as Google or Microsoft is, pushing Metal and WebKit just as shamelessly as Microsoft crams the corpse of DirectX into things. This isn't a charity project, it is another way for Apple to control iOS software distribution, their primary service cash cow, Tim Cook's pride and joy. Apple is happy to give Google money for their Apple Intelligence integration, this isn't a grudge that they take seriously.

Apple could have supported KHTML upstream, and killed Blink in the cradle. They could have made Safari a billion-dollar cross-platform product, and won. They made this horrible bed, and now they want to users to moralize Google's victory. Why would anyone, knowledgeable or naive, insult themselves by standing with Apple here?