From the article:

"I know for a fact that Wikipedia operates under a CC BY-SA 4.0 license, which explicitly states that if you’re going to use the data, you must give attribution. As far as search engines go, they can get away with it because linking back to a Wikipedia article on the same page as the search results is considered attribution.

But in the case of Brave, not only are they disregarding the license - they’re also charging money for the data and then giving third parties “rights” to that data."