Business model wise, Brave is same thing as Google just at a smaller scale. Their revenue stream is still ad monetization, just it happens that it does not come from Google (although it is curious that on default settings, Brave's ad blocker does not block Google ads?).

And what does the world look like if Brave "wins" (meaning becoming Google size)? Still ads everywhere, just Brave gets to pick them.

Worth noting is that people would run ad-blockers even if all ads in the world are privacy-respecting. Users simply do not want ads on the web pages and eating the bandwidth.