How so? If you're thinking about Eich's politics, those are/were HIS, not Brave or Mozilla the organization's. Brave the organization's politics are pretty narrow and what you'd want out of a browser: Privacy and user control.
Meanwhile Mozilla the organization boots people for politics, wants "more than deplatforming" and uses as one of their examples organizations deciding what I should see on the Internet - preferring outlets that Mozilla themselves like, naturally. They publish stuff with the gist of "did you encounter other politics on YouTube, how scary".
Meanwhile the organization spends money on getting a sneaker designer to make time-limited color themes for their browser and writes a pile of copy about how cool it is that a sneaker designer painted the browser blue.
https://imgur.com/a/ZmUzr0q
Meanwhile, Brave releases a user-customizable filtering function for their search engine so you, not someone else, can decide from what POV you see the Internet and added native vertical tabs to the browser.
One organization is blatantly political, the other just makes a good browser.
You can run a similar set of comparisons for Vivaldi, who are also clearly a much more product-focused organization and it shows. They have some more visible political leans as an org, but still far milder than Mozilla's, a lot of those leans being just being vehemently anti-crypto, with the biggest focus going to user control and privacy, as it should.