Demoted admins

WoWWiki

 * 10 admins lost their rights.

Wikisimpsons

 * Admin demoted by Staff.
 * Admin on Oct 25 demoted by Staff.

Grand Theft Auto Wiki

 * At least 4 admins lose their rights by staff, description says there was "mass deletion" in a couple of cases.

PVX

 * Admin rights of 5 editors taken away then restored the next day by staff "due to ongoing issues on this wiki".

Talisman Wiki

 * Admin rights of 2 editors taken away by sannse for "acting to damage the wiki".

Micronations

 * Nine admins desysoped by Wikia employee DaNASCAT: "Old Admin team has left; clearing way for new team". and giving bureaucrat and sysop rights the next day to one user who was never sysop just for volunteering.

Donkey Kong Wiki

 * HavocReaper48 had his bureaucrat rights removed by sannse "due to ongoing issues on this wiki".

Dead Rising Wiki

 * The administrator team's rights were removed to "make way for the new admin team" after moving off Wikia.

Pikmin Fanon Wiki

 * 5 sysops (2 of them bureaucrats) had their rights removed. Wiki team has left; clearing way for new team

Jedipedia

 * All original sysops and bureaucrats had their rights removed, and given to a new one. Reason: wiki adoption.
 * Later, one bureaucrat (admin in ShoutWiki who had adopted the old wiki) had his rights removed, after adding a link to moved wiki in a common template (which transcluded it to nearly all articles), although another bureaucrat later gave the rights back.

Gaters Wiki

 * Only admin (moved to ShoutWiki) deleted pages (as had been done on 7 other wikis, also requested it to be deleted, Staff restored the pages and removed adminship and deleted other wikis). Admin had a notice up, Staff removed it, Editor vandalized, Staff banned him and redirected the entire wiki to Stargate Wiki.

SpongeBob Fanon Wiki

 * All bureaucrats demoted by sannse.

Lost Media Wiki

 * Bureaucrat demoted by BertH.

Wikizilla

 * All bureaucrats, administrators, patrollers and moderators demoted by sannse.
 * Editors who posted links to the new site were banned.
 * The old Wikizilla received new admins and has been prevented from being renamed, thus putting the old and new sites into competition with each other.

RuneScape

 * Literally every active admin got demoted on the RuneScape and Old School RuneScape wikis
 * Over 39 on RuneScape: https://runescape.fandom.com/index.php?title=Special%3ALog&type=rights&user=BertH&page=&year=&month=-1&tagfilter=
 * Over 18 on Old School RuneScape: http://oldschoolrunescape.wikia.com/index.php?title=Special%3ALog&type=rights&user=BertH&page=&year=&month=-1&tagfilter=

Mega Man Fanon Wiki

 * 6 admins (half of them bureaucrats) had their rights removed by JoePlay.