Everytime a discussion about browsers comes up, I ask myself, how is the development of those actually funded?
Pretty much all browsers are "free"
They all mostly get funded by Google, and if not Google search, other search engine companies. Google pays out a huge amount of money to browser developers for driving traffic to their Web sites or using their services or serving up their ads.
Brave uses ad blocking, which I'm sure cuts into their potential revenue that they might make from serving up ads. To make up for this, they have an optional voluntary scheme for you to see a limited number of ads to support them. They also have their own cryptocurrency.
Apple, by the way, gets BILLIONS (yes, with a "B") of dollars from Google simply by offering Google search on the iPhone. It's all about the ad dollars on the Web. The money that Apple gets from Google keeps Apple from offering their own Web search engine, even though it has been reported that Apple has long had one all ready to go.