“In some cases, however, these banners can serve as trackers themselves, as they engage in a privacy-breaching data exchange before the user even has a chance to opt out.”
GDPR was supposed to stop tracking. Instead it produced a banner on every page, and some of those banners track you before you click anything. Brave now blocks them in version 1.45. The fix for a privacy law turned out to be a browser that ignores its paperwork.