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Bluesky is booming in Japan — mainly for reasons other than U.S. politics
(www.japantimes.co.jp)
This is a most excellent place for technology news and articles.
Anecdotally, a lot moved to Insta or maintain both xitter and insta, but yeah, there's no real inertia to move and, outside of otaku circles, it seems that mastodon and the fediverse are basically unknown.