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There is a paid subscription tier of the brave search which certainly is used to partitially fund this project. Other than that. Brave also serves ads in their search results for free users. Those however are not based on your profile but are based on your current search (similar how DuckDuckGo and Startpage are handling their ads).
And in 10 years: Fishes are dying due to the severe lack of nutrition in sea water after humans exploited it for mining of metals. We’re not learning of past mistakes.