Ad blockers at dns level too, not just browsers. A lot of people don’t even know how to block them, check your parents or kids (or non technical people in general) phone and you will see how they are riddled with ads. I had a dns blocker installed on my parents phones and in around 6hrs it blocked 10k queries from 3 apps only..
Gotta tackle such issues at different places all at once for sure. It's like wearing 5 digital condoms at once. Too bad there's still some leakage somewhere for sure. B)