You don't have a right to show ads to users. (The CFAA actually works in consumers' favor here: circumventing a user's adblocker is just as much of a crime as hacking into a server.) You do have a right to refuse service to users with adblockers, but to my knowledge Brave doesn't interfere with sites that do this - I still can't get past the paywalls on WSJ/NYTimes/Bloomberg.