When you use PredictIt, we may employ technology such as “clear GIFs” (a.k.a. Web Beacons) which are used to track the online usage patterns of our Users. In addition, we may also use clear GIFs in HTML-based emails sent to our users to track which emails are opened by specific users. … We may use cookies, clear gifs, log file information and mobile app information for purposes such as …(c) sending advertisements (including display media) to you when you visit our website or other websites, and monitoring the effectiveness of our marketing campaigns …
Educational, eh?
From their privacy policy: