Brave, a privacy-centric web browser, is running advertisements on partner sites that taunt the browser developer’s competitors such as Google, Mozilla, Microsoft, and Opera. The ad states that the visitor’s installed browser is not only tracking their location but also hinting that it tracks much more than just your location. Brave said that the ad was actually being run by a partner and we’re fixing this right now, you won’t see those ads anymore. It is not known if this an affiliate partnership or if Brave paid to host these advertisements.
Source: https://www.bleepingcomputer.com/news/software/brave-browser-taunts-chrome-edge-and-firefox-in-new-privacy-ad/