There are dozens of ways how browser devs could make it default, without making it default - by way of malicious compliance. Example: The first time the browser is opened, display a big fat page asking "DO YOU WANT TO BE TRACKED & SURVEILLED ON THE INTERNET??? NO (highlight in nice colour) / YES (add dark pattern here) / learn more (in tiny font)". Pretty sure most people would click "NO". Every couple of weeks it could pop up again with a similarly phrased question "ARE YOU SURE YOU STILL DON'T WANT TO BE TRACKED?" but this time with a nice UI element where the user can specify that the answer to this rhetorical question will stay the same for the next n days/months/years/decades/centuries/millenia.
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There are dozens of ways how browser devs could make it default, without making it default - by way of malicious compliance. Example: The first time the browser is opened, display a big fat page asking "DO YOU WANT TO BE TRACKED & SURVEILLED ON THE INTERNET??? NO (highlight in nice colour) / YES (add dark pattern here) / learn more (in tiny font)". Pretty sure most people would click "NO". Every couple of weeks it could pop up again with a similarly phrased question "ARE YOU SURE YOU STILL DON'T WANT TO BE TRACKED?" but this time with a nice UI element where the user can specify that the answer to this rhetorical question will stay the same for the next n days/months/years/decades/centuries/millenia.