@TechnoBear, @info1892, @malwinblaze22 Thank you all for contributing.
Due to the difference in opinions and my inability to find an official resource that address my question, I have came to a decision to leave all
alt attributes empty as in
alt="" for now.
I will see how it plays out in a couple of month, if images start appearing in Google Images search then thats great, if not! i will risk it and add the same
alt for all images.
Thank you all.
NOTE: other ways Google might understand whats the images are about on a certain page are: image title on hover, image file name,
<h1> heading, page title in browser tab, page meta description.