Users are then able to opt-in, if they like, to a novel advertising platform within the Brave ecosystem. These users can earn rewards for their attention (70% of the associated ad-revenue). Ads are displayed within Brave and on the user's desktop; ads are not displayed in any publisher-owned space (e.g. a website or YouTube channel).
With these rewards, users are able to contribute to [verified] sites, channels, etc. The publisher/content-creator must already be verified to receive any rewards from users. If a user attempts to contribute to a non-verified site, the tokens remain on the user's device for up to 90 days.
This isn't much different from how PayPal allows you to send money to an arbitrary email address, regardless if it is associated with a verified PayPal account or not. This model simply addresses the problem of blocking harmful ads and trackers, while offering no alternative means of supporting those same content creators.