A simple guide to choosing your browser: Does it make money by showing you ads? Chrome: Yes Brave: Yes Firefox: No If yes, then they need to track your behavior in detail. I'm sure you don't deserve to be tracked.
Brave's stated goal is to establish an alternative ad-based business model that's long-term viable without the user being tracked. Will this be successful? Who knows, but at least they're trying to find a business model that respects your privacy while being long-term sustainable. Firefox's model doesn't, at least the way it works now.