I am on a friendica instance that allows me to see images with #AltText (or rather not see images WITHOUT AltText), because there is a setting which says
"Hide pictures with empty alternative text (Don't display pictures that are missing the alternative text.)"
So this is what a visually impaired person would receive - how do you describe the image that has (presumably) been posted?

p.s. If there is no alt text shown here it is because I have posted from my laptop. I will check on my mobile and update the image and text there!