Well, I don't know what they do with it bc I do not see ads on Brave Browser - it's an entirely different Internet.
Don't opt-in and enjoy an ad free experience.
Brave was caught inserting their own referral code in signup forms on websites. This is basically exactly what Honey is doing and under fire for right now.
Brave basically does a man-in-the-middle attack on those websites. This goes MUCH further than just a privacy issue, it's a security issue.
I don't care about privacy, it doesn't exist, and I use Chrome. But I won't compromise my security by using a browser that is happy to pirate the pages I view.
I use Edge occasionally - which is far superior to Google and I don't kno how ppl deal with browsing the Internet like that, it's wildly frustrating.