Also, censorship software is infamously bad at curation. Peacefire isn't around anymore these days, but the sites blocked by local censorship software around 2000 is pretty terrible, whether they used keyword filters or URL lists. See the list of sites in the left column at https://web.archive.org/web/2020/http://www.peacefire.org (peacefire circumventor is a tool I used to use to access blocked sites at school)