Accusing others of astroturfing and shilling breaks the site guidelines. You don't know why other users downvoted a comment, and jumping to public accusations about that degrades this site badly.
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.