Brave says:
Brave shares 70% of the revenue from our new privacy-preserving Publisher Ads with content providers. The project is currently in development and being tested with select partners. Brave’s Publisher Ads are available on an opt-in only basis, and you can cancel at any time. There is no obligation to sign up. Read more about it here. Publisher Ads will be available more widely soon. So, please keep an eye out for more information as it becomes available.