Europe tech often times are open source with commercial service.

At least it’s better than whatever Google, Microsoft, or Tencent.

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Some fedi software are esoteric, like Misskey have Misskey flavoured markdown (example), even Mastodon cannot display the feature. There are fedi software that can be accessed via console, zero image displayed. Some others have non-conventional design that caters to specific use, basically not even for mainstream people, so they don’t even follow any accessibility rules.

Some software does not support alt-text, so people write the text on the post itself or comment.

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+