I have from a friend closely involved with Brave and this is what I understood from them about how it works:
Brave will not insert ads without user consent so you have to opt in (which is fair as a means to repay the content provider for using their time and bandwidth).
Ads are matched privately on your device, no signals or cookies out and ad impressions or other attribution/confirmation communicated out, so you can stay anonymous.
Their revenue model is they get a percentage of what they share. So they don’t track you or otherwise make money off of you if you don’t opt-in to the ads, in fairness it is good if users opt in so they can get revenue too. (I have been)
Sounds good...I have also made a “deposit”(small amt. of BitCoin) and have “opted-in”. This seems to be a good “grand experiment” with less annoying adverts, but not sure it will succeed...the site owners & advertisers may not “buy in”...even though Brave is a viable/sensible alternative. We’ll see I guess.
thanks