Sources say Google is working on an ad blocker that it plans to ship with Chrome in the upcoming future. The new ad-blocking feature would be turned on by default for all users. Chrome has a browser market share above 50% and any built-in ad blocker would allow Google to become the dominant force on the ad blocker market. The move will have the direct effect of webmasters reviewing the ads they show on their sites and removing the ones that don’t comply with recently released ad standards.
Source: https://www.bleepingcomputer.com/news/google/google-working-on-an-ad-blocker-for-chrome/