So the ads catalog is full of Google Analytics URL tracking parameters (utm_source, utm_medium, etc). As far as I know, Brave blocks Google Analytics by default.
The Brave team should auto-detect these and let advertisers know that they can’t rely on Google Analytics to track their Brave Ads campaigns. Otherwise, advertisers may get the incorrect impression that their ad campaigns aren’t working since they won’t see many visitors in their Google Analytics dashboards.