There are so many things wrong with brave. The whole business model is unethical, replacing ads from websites with their own. Brave uses a crappy "cryptomoney" which doesn't mean anything (they could very well use a non-crypto virtual money, they only make it "crypto" to attract attention).
The CEO is homophobic, and now he expresses weird beliefs around COVID.
I've also seen brave being promoted by right-wingers. I don't really know if their userbase is really skewed towards the right.
Personally I'll stick with Firefox. Even if Mozilla is imperfect, they are actually working to make the Web better, by promoting diversity of browser engine, fighting harmful web standards, and leading the charge on many fronts regarding bettering the Web, not just adding a layer of bullshit that doesn't help anyone. And when it comes to ads/tracker blocking, Firefox's advanced tracking protection + uBlock origin is pretty much the best you can get.