User blog comment:BertH/Anonymous editing and your community/@comment-4568327-20150723024820/@comment-4568327-20150725011529

I can actually imagine why Wikia would not want to make the AbuseFilter extension a "flip on" feature. Abuse filters require knowledge in what you're doing in order to code them, and if you're not careful a filter can easily block every single edit to the wiki (This happened on Wikipedia more than once, see Wikipedia:Village_stocks#Master_of_Puppets_for_the_Town_Crier_award and Wikipedia:Village_stocks#Reaper_Eternal_for_the_.22Block_ALL_the_edits.22_award). Even then abuse filters are still very subject to abuse, and an admin who knows how to code filters could still very easily block anon editing.