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+

This project is not “Nextcloud” only. There are eight vendors competing on Nextcloud also contributing.

USAmerica is just corrupt country that non-profit is just a way to avoid taxes.

Most of parts of the world won’t let non-profit to be turned that way.