Pardon my ignorance, but I did not get this part "when the preview shows a vulnerable alert", how is this happening? From the blog you linked, I see that the pr

Pardon my ignorance, but I did not get this part "when the preview shows a vulnerable alert", how is this happening? From the blog you linked, I see that the preview is basically generated from the opengraph tags for a given link, not really sure how a phishing/vulnerable links can be caught beforehand via these previews?