Nov 23, 2015 - 10:13 AM
We restrict Google from scraping the images as images are used by spammers to steal your images, you never get quality traffic from image search. Thus we restricted the alt tags to be entered as there is no reason for them.
We do allow alt tags on product pages as we use them for scrolling titles.
Alt tags give you little to no weight for SEO ranking, even though they are recommended to have (for Google Image search reasons)