Board Thread:Support Requests - Getting Started/@comment-33944054-20200726122527/@comment-9605025-20200728002330

In the case of another user adopting the wiki. your permissions would be removed and they would be given full permissions.

If you want to control who can edit, then you would need to use a different platform to host your site. Fandom uses MediaWiki to run its wikis. Two major alternatives that also use MediaWiki are Miraheze and ShoutWiki. Both of these alternatives would allow you to restrict editing. Fandom, however, does not.