Don't know if you're still looking, but anyways, here's a relatively big list of possible options https://www.mediawiki.org/wiki/Hosting_services and out of all of them https://miraheze.org/ seems to be the best fit (it's free, UK-based and should be ok for the most part; also I'm in no way associated with them I just want a nice wiki for the game)
Here are some links for your careful study with some thoughts after a quick read:
ToS - https://meta.miraheze.org/wiki/Terms_of_Use ; fairly standard stuff (nothing prohibited by UK law, no responsibility for incorrect info in user's content, some administration on their part, etc)
Privacy Policy - https://meta.miraheze.org/wiki/Privacy_Policy ; typical stuff for any hosting provider (stuff like sharing some rights to content to provide service), same as Fandom, non-registered content edits show IP address and registered show username
Content Policy - https://meta.miraheze.org/wiki/Content_Policy ; this should be most carefully scanned
- point 1. seems to target e-commerce, quoting "However, you can have limited fundraiser-type sales or provide an informational site supporting a commercial activity (for instance, a wiki describing characters from a commercial work of fiction)." so links to other platforms (ex. patreon) shouldn't be a problem
- point 4. someone has to admin wiki but I presume that was already a thing
- point 6. I don't believe game's ambigious on this front
- after point 13. default wiki content license is CreativeCommons but can be changed to non-permissive licenses etc, more here https://meta.miraheze.org/wiki/Help:Changing_your_wiki_license
- and very relevant section of rules for NSFW stuff
- main page has to have entry popup that wiki is 18+
- no explicit images on main page
- explicit images on side pages should be "where possible" collapsed by default (yay, no more blurred images)
- there's also sentence in bold font, that subdomains and site names shouldn't be explicit - I think both ToA or full name for domain shouldn't be an issue, as for side pages it shouldn't be too hard for admin(s) to set custom URLs that are safe