Hrm - would you want federated wikis? What’s the benefit vs wikis run independently?
For example, wikipedia has a corner on encyclopedia type knowledge. No reason to federate as the central moderation on Wikipedia seems to work well. To be honest, I wouldn’t trust encyclopedia type information from another wiki site as I don’t know how active the community is there to maintain the accuracy of the information.
Then there’s other wikis I know about like for games (thinking fandom.com) - but again not really a reason to federate between those that I can think of.
To be honest, my gut reaction is that I want fewer wiki sources, not more.
Ok but to balance it: it forces you to confront your own on the topic as well.
That would force you to selectively use it since often times reality is somewhere between our personal view of it and other opposing views.
Chose the wrong situation and you’ll both be crying in the corner with shatter worlds. Chose the ones where the people are truly disconnected from reality and perhaps you’ll change their lives - hopefully for the better.