Board Thread:Support Requests - Community Management/@comment-40083041-20190806175000/@comment-26569706-20190807224143

Talk to him politely about why you think his actions are wrong (do it on here on Community Central). If he fails to listen, then it would be a good idea to leave the wiki.

You can always contact Fandom staff about this - they might not be able to do much, but at least they might provide some useful advice.