Not that I think their proposition is better but the Brave people particularly are trying to push a different model with their attention token scheme, so it's not that no one can think of something different, just that it's enormously hard to get people on board when the old advertisers are holding on to everyone using every single way at their disposal, legal or not.
Brave is trying to be the middleman and launching their own ad network. I think browsers forcing a business model onto publishers still isn't the right answer.
