The untold story here (that is, however, indirectly acknowledged by Brave) is that user tracking is required by websites to prevent being completely defrauded by ad providers / advertisers being defrauded by click bot farms. Without providing viable alternative incentives, this will just move the ad driven part of the web into closed networks (Twitter/FB) where everything is single domain.
Is this really the intended outcome?
(It's nice to see Brave have an effect, though.)