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Ibis-Wiki (A federated encyclopaedia)
(lemmy.world)
Introducing IBIS-Wiki
A federated encyclopedia which uses the ActivityPub protocol, just like Mastodon or Lemmy. https://ibis.wiki/
Hm, that's not how Lemmy communities / threads tend to develop. Unless you're considering the effects of defederation I guess.
Missing an /s?
Take a look at the 'news' on various instances like hexbear vs world and it's night and day. An encyclopedia is meant to be factually reliable, but if this works like it does here you would have the equivalent of conservapedia and prolewiki sitting side by side as 'true'.
Any encyclopedia will reflect the biases of its editors. The best you can do is to have good procedures and fact-checkers.