I had an original RPi B (an early version with only 256MB RAM) knocking around that was unused and I was always struggling for a project to put it to use.
With the Edge browser not yet supporting ad blockers I have resorted to modifying the HOSTS file, but that is a pain to maintain across multiple machines and it's not possible on Windows Phone.
So at the weekend I set up a
Pi-Hole, and I've got to say that I'm impressed. Quick to install on the RPi and then only needed some simple router configuration (static IP for the RPi and then set the RPi as the primary DNS).
Browsing some websites with a horrible amount of Ads (like windowscentral.com) is now much more tolerable, especially on my mobile.
Only thing I saw that was unintentionally blocked were videos from the BBC Sport website, so I need to investigate getting those whitelisted. Other than that it looks pretty good so far.