While many websites depend on revenue coming from ad banner impressions and clicks, it’s a fact that some of these ads can be very annoying, and in a few cases, even malicious. Some ads are created by rogue pop-up pages, while others automatically start playing video or audio clips. Many more are guilty of taking up too much of your phone’s resources with overused animations.
https://www.androidority.com/block-ads-on-android-869724/