alt Hacker NewsSigh, that's a lot of words to describe DNS based adblocking.
In Android you can either set your DNS server in the system settings or via the VPN API.
Sample code here https://github.com/t895/DNSNet/blob/a-couple-updates/service...
They both do the same thing. There are local device-only resolver apps like
https://github.com/m66b/netguard
Another famous one is DNS66 but it's sadly unmaintained. Avoid apps with the word "ad" in their name, they are usually semi commercial and can't be trusted.
Do note all of these methods can be overridden on the app level e.g. a lot of browsers come bundled with first party VPNs or use their own built-in resolvers.
If you want something more reliable, Firefox on Android with the UBlock Origin and Sponsorblock extensions is still the gold standard. Though do note the Android Firefox is extremely slow compared to the Chromium based browsers.
For app level ads, use an app patcher like https://github.com/morpheapp which can remove all in-app advertisements and inject sponsor blocking code.
In what meaningful way is there any difference in speed between Chrome and Firefox on Android?
I also prefer replacing uBlock Origin with Ad Nauseum which is built on top of ubo.