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.
