Google confirmed earlier this year that it would bundle ad blocking into Chrome in 2018, and now we know exactly when that blocking will begin.
Starting February 15, 2018, Google Chrome will block ads that have a "failing" status for more than 30 days with the Better Ads Standards from the Coalition for Better Ads.
Some examples of desktop ads that are "bad" according to the Coalition for Better Ads are pop-ups, auto-playing videos with sound, and prestitial ads with a countdown. Meanwhile, "bad" mobile ads include pop-ups, flashing animated ads, auto-playing videos with sound, full-screen scroll over ads, and prestitial ads.
Ads are a major part of the internet, and they help a lot of websites keep their lights on. It can be frustrating when you encounter a bad ad that makes it difficult to consume the content that you're trying to get to, though, and that's what Google is trying to fight with Chrome's built-in ad blocking.