the previews are supposed to help you decide whether the link is worth the click time. the links are not advertisements.
i’m in two minds about snap previews actually. some part of me thinks it is useful. some part of me think it is a nuisance to the reading flow.
anyhow, they can be disabled. click the ‘disable’ option on the top right corner of the box and then choose to disable it for this site, if they absolutely irritate the socks out of your shoes.
anyways, i probably trial run this for a week or two and see what feedback i get. hate it or love it, let me know.