I would argue that the whole reason for Brave's existence is BAT. It's their business model and I'm surprised that HN normally hates cryptocurrencies with a passion but gives Brave a pass.

First, HN isn't some hive mind that takes stances as a collective. Second, cryptocurrencies are a technology and can be used for good or bad. To hate them is like hating linked lists. Third, there is plenty of (undeserved) hate for Brave here on HN. Lastly, "the whole reason for their existence" is a subjective judgement. As long as they remain open source and don't force me to use their cryptocurrency, I am completely fine with it.