I know it sounds like a conflict of interest but it seems if they can clean up ads then people might not want to use ad blockers as much. Then it won't hurt them & there ads are safe.
https://www.wsj.com/articles/google-plans-ad-blocking-feature-in-popular-chrome-browser-1492643233
https://www.wsj.com/articles/google-plans-ad-blocking-feature-in-popular-chrome-browser-1492643233