It’s not federated by any means, but if you want to replace FANDOM wikis with other equivalents, Indie Wiki Buddy is a great extension to have on hand.
There’s options to remove FANDOM from search results in favour of other options, and they also allow you to redirect to the Breezewiki frontend for FANDOM to get rid of all those shitty ads and UI, which is legal considering the contents of FANDOM pages are still under the Commons.
The country of freedom sure does a lot to prevent the free expression of others.
Why is it that the only freedom they ever seem to focus on is the freedom to isolate and not the freedom to participate?