[img alt=Image loading...]https://bitcoin.org/img/icons/logotop.svg[/img]
My suggestion: is it possible to set this alt-text as a default for all embedded images?
It's not a big task to do so yes it's possible.
However this is what I think. Someone with little experience in the forum and if the person is aware of the issue (which they will learn as they go) then they can add this alt attribute on the tag. i.e: for URL tag, we can simply discover how to use it.
Not a big deal in my opinion.