I am certain many jailbroken androids are out there using adblockers. Firefox also has plugins internally blocking ads.
https://addons.mozilla.org/en-US/android/addon/adblock-plus/
https://addons.mozilla.org/en-US/android/addon/adblock-plus/
https://news.ycombinator.com/item?id=17639624
https://medium.com/@trybravery/please-stop-using-adblock-but...
https://translate.google.com/translate?sl=auto&tl=en&u=https...
Recommend uBlock Origin instead. "Free. Open source. For users by users. No donations sought." https://github.com/gorhill/uBlock#installation
You'll have to get it from the F-Droid app store, but this doesn't require a rooted phone. It uses a local VPN to block ads at the network level, hence no ads in your apps as well
I've been using this for a month and it works wonderfully