If you'd please review https://news.ycombinator.com/newsguidelines.html and stick to the rules when posting here, we'd be grateful. You've been breaking them a lot and we've had to warn you many times already.
We don't micromanage HN according to YC's particular investments in startups; what's in YC's business interests is to make HN as good as we can, because that's what keeps the community coming here. But if it helps, I don't think YC has any investment in Brave.
If, on the other hand, they're using voting rings, astroturfing, or other forms of abuse to spike their ranking because the content isn't interesting enough on its own, that's bad, and yes we spend a lot of time counteracting that. But if you think that's happening, you should send links to hn@ycombinator.com so we can investigate, not post dyspeptic complaints about it in the threads. Those just add noise.