People tend to think of ALT text as a "good thing to do for people with disabilities". That is true, but also reductive. It is useful for everyone, as is generally the case with accessibility.
I sometimes see posts with screenshots of text in a language I don't speak. If they had ALT text, I could use the "Translate" feature, and it would translate both the post and the transcription.
If you post in English, everyone who doesn't speak English fluently will benefit from ALT text.
@eloquence 100% .
Writing good alt text is hard (uploaded few of my cat pictures and was suffering to write something). Still reading alt text helps when you watch picture and don't get it, then alt text points out what you must focus on which helps when you missed obvious.
From personal experience: I wanted to see more fanart on gacha game I enjoy. #arknight have almost no action. I gone and found Misskey.io have JP artists posting art. Having text on art and no idea how react or is it NSFW...