The change, made by Merrystar, is listed in the Recent changes. My admin rights got removed as a result of the adoption process. However, my user page has been locked so it can't be edited by anyone who's not an admin.
It was basically some users trying to wrestle control of the site. There weren't enough productive users, so the wiki's "community", as seen by Wikia, were the users who were really being disruptive, which was why Wikia didn't take any action; they go with whatever the most users favor and don't step in when injustices take place.