Google recently stopped serving ads to 200 fake news sites.
From Recode:
Publishers were banned in November and December and included sites that impersonate real news organizations through shortened top-level domains, according to Google’s 2016 “bad ads” report, normally released at the beginning of each year.
So-called fake news publishers will sometimes take advantage of “.co” domains by appearing similar to legitimate news sites that would normally end in “.com.”
Google declined to provide a listing of the banned sites.