Yes. They consider it a violation of their "forking policy"[1].

Fun(?) fact – Fandom put even more restrictions right after Minecraft Wiki moved[2]. Now it doesn't even allow wikis to put a banner on their main page saying that there's a forking discussion unless they contact Fandom support and get permission.

[1]: https://community.fandom.com/wiki/Forking_Policy

[2]: https://community.fandom.com/wiki/Forking_Policy?diff=375705...