I disagree with the article. It appears to make two points, both don't convice me.
The first one is about a political donation made by the founder 15 years ago to the tune of 1000 USD. It was against gay marriage. While I somewhat support gay marriage, I find it totally acceptable to be opposed to it. It depends on what marriage means, and people don't agree on that. For some people it just means a strong bond, stronger than a normal relationship. With this definition, gay marriage isn't an issue.
But to other people marriage is an envelope that's supposed to foster reproduction and family building. With this definition gay marriage isn't exactly straightforward. Neither should it be for people with fertility problems and women over 50 in general. Are convervatives also against that? I guess they should. Whatever. I started off thinking I could defend the stance, now i don't think i did. Either way, ditch a browser over this nonsense?
And if Tim Berners Lee spews some BS, will you stop using the Internet? Or if your country elects a stupid president, will you boycott the country and leave temporatily?
The other issue is what Brave does with ads. While I agree it is imperfect, I think in general the approach is among the better ones around.