This is why I mentioned (and variants). While I’m unhappy with the Mozilla situation, Firefox is still a significantly better option than Chrome at this point, and the various forks address any concerns with their privacy policy.
One can even self-host their own sync server if so inclined.
And Google never made that promise to being with. Hell, it's their primary business!
Mozilla has done plenty of bad things and they rightly deserve criticism, but options in the browser space are few and Mozilla is considerably less bad than Google. And other Chromium browsers perpetuate Google's control over the web. If you're going to complain about Mozilla when someone recommends Firefox, at least offer a non-Chromium alternative like LibreWolf (or maybe Ladybird someday).
Mostly because they're peeing in the pool. Mozilla deleted their promise to never sell its users' personal data.