Currently, Block Trackers uses host-based blocking methods (we frequently update our lists) to prevent tracking scripts from loading and telemetry requests from being sent. In most cases, this is sufficient to protect your computer from tracking by apps, websites, and your OS.
We’re currently working on integrating more sophisticated filtering into the application to enable blocking many 1st-party tracking methods (i.e. trackers loaded from the same domain as content, HTTP header cookies, etc.). Stay tuned for updates on this!