You know that Fediverse is decentralized, right? Lots of instance barely have anything American, especially Asian instance.

Lots of fandom-related wiki are hosted on Miraheze, no ads and full freedom.

Abolutely unrelated to “federated” in fediverse sense. Maybe decentralized, yes.

Most of Japanese users are on Misskey, and most of instances never reports active or total users publicly due to privacy, but you can check its statistics on about page.

A lot of users even private their following/follower lists.

Like misskey.io have 700 thousands+ users with daily user visits around 15K+