Funded by Palantir Technologies by the way [1]
Their ad rewards system analyses and modifies the original webcontent, replacing existing ads with their own (and who knows what other code they inject) [2]
Then there's their hidden tracker URL whitelist [3]
No thanks.
[0] https://twitter.com/cryptonator1337/status/12692014801055784...
[1] https://www.reddit.com/r/firefox/comments/fe37ml/exclusive_b...
[2] https://brave.com/brave-launches-user-trials-for-opt-in-ads/
[3] https://news.ycombinator.com/item?id=19129309#19129642
Edit: Nearly forgot about their partner promo headers that they can and do update on the fly https://laptop-updates.brave.com/promo/custom-headers