This is tech limitation If site has ads served from main domain you can't block them You can block ads with some static files on subdomains/domains, and this

This is tech limitation If site has ads served from main domain you can't block them You can block ads with some static files on subdomains/domains, and this drastically change content (like how is image sites looks like without images?) So, using DNS filtering for big ads providers is OK For small and smart ads providers will not work And I mean ads and tracking the same thing. While you can block all kind of "analytics", at the same time you can't block web-server logs with your IP (cookies, etc)