I've been looking for explicit alternatives to Fandom for some content and it's annoyingly sparse.
Just the other day I saw some meme about how if we saw as many ads taking over sites like we do now, that was a sure sign of having your machine getting infected with a virus.
Generally I've found a good portion of websites that block users with ad blockers tend to be the worst offenders with aggressive ads...
I launched a website that is niche a few weeks ago, but totally unique. After a couple of weeks search console wakes up to tell me that they have indexed one page in 80. And that the top search term that is finding my site says exactly the name of one of my pages, yet Google is showing my homepage in search!
Way to help your users
But it ended up being the only reasonable place we owned where we could put Fortnite, Overwatch and Valheim wikis that wouldn't get crushed by this new Google jail situation. Of course the alternative is what the parent comment suggests ("probably just need a good base domain for game wikis") - but you have to get THAT domain out of Google jail first. Chicken and egg.
OTOH if the goal is to monetize other people's contributions then yes, I totally get why the "Google jail" would be bad for that, but I'm just not sure that its a cause worth fighting for- that road basically leads to a new Fandom.
There's a ton of historical evidence of wiki migrations (1) starting out with all of the editors and none of the readers, (2) not doing anything to get those readers to the new site, and (3) ultimately losing the whole war because the reader->editor flow was still happening on the Fandom wiki. "Invisibility" is absolutely not desirable here, even if your only goal is maximizing the amount of good contributions.
That answer is quality content (higher than AI or human medians), links and pr and social activity and mentions, and then user experience.
The James Bond wiki is particularly bad, but Memory Alpha seems to be better run.
It sounds like the issue isnt for "independent wikis" but for wikis competing with an existing domain already hosting one on the topic, in this case fandom.com's.
Entertainment studios can often turn a blind eye to use of their properties when it's by fans, for fans, and promotes those franchises. They are not sending C&D to people making avatars, or cosplaying, or memeing their screengrabs into notoriety.
It is weird to think that the WMF and Wikia/Fandom had a common founder and origin.
Field v. Google, Inc. (2006)
https://www.practicalecommerce.com/Search-Engines-Indexing-a...
Authors Guild v. Google, Inc. (2015)
https://www.flaglerlawgroup.com/a-new-era-for-fair-use-court...
https://github.com/IndieWikiBuddy/indie-wiki-buddy