Brave's ads don't leak your consumer profile to the advertisers. Only Brave themselves know who's seeing what (and even then, only client-side, unless they push a malicious update one day.) Advertisers only get to know how many impressions they got.

By contrast, every credit card with "rewards", retail loyalty card, or coupon app (e.g. Honey) you've ever signed up for is — very explicitly — selling your consumer profile to advertisers/market research companies. Then, to make you interested in being on the other side of that deal, they take some of the money they make from those data-buyers and pass it back to you as rewards/points/offers.

If neither of these business models already existed, and both were pitched at the same time, I think it'd be the second one that would put people in mind of dystopian speculative fiction.