DNS66[0] can block ads without root.
> I thought you had to root your Android to block ads?
Maybe with Chrome, but there's an Android version of Firefox that lets you install uBlock Origin:
https://play.google.com/store/apps/details?id=org.mozilla.fi...
In my household we have four people with smartphones and another four laptops. That's a lot of ads to block.
Blocking ads on my laptop made a more noticeable improvement to web browsing than increasing my network bandwidth.