Fediverse

US-controlled and domiciled site - yes, but I do not see it having a monopoly on information at all. Sure is big, has lots of info, pages, it is a rather good resource in linking stuff to the various concepts that you want to explain others e.g. in an argument.

But the very fact that anyone can edit information makes it not recommendable in academia, for example (really, when I was a student, all my professors were generally not recommending it for information because, as one of them said, even grandma could edit it). So I don't think I would trust ibis on scientific articles either, at least not in the fields I'm directly interested in - maybe for some random trivia/did you know stuff, idk.

limited / niche wikis

But this is where I think it would really shine, indeed, as one could make a wiki about a game or software more easily, probably link pages from different instances, etc. (as others said already).

Don't know what else to say, it just seems like an interesting project. Congrats to anyone involved on this first release and looking forward to see what this project will bring.