The warnings have been worded by their legal department to avoid litigation. A similar "blacklist" by Google (safe browsing) exists and they define what language you should use if you use their blacklist to warn users (see End-user visible warnings @ http://code.google.com/apis/safebrowsing/developers_guide.ht...). An excerpt: These guidelines help protect both you and Google from misunderstandings by making clear that the page is not known with 100% certainty to be a phishing site or a distributor of malware, and that the warnings merely identify possible risk.