Getting images for links can be tricky too, you need to make sure they're all https, formatted right (file type and size) then you need to store them as well, p

Getting images for links can be tricky too, you need to make sure they're all https, formatted right (file type and size) then you need to store them as well, plus a ton of sites (especially tech ones) don't have proper markup and have no images available to use, so it's basically too much hassle and HN works fine without it.