Google warns of bad webpages?

[imagenious]

Got this today going to a site via a Google link:
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I've been using that site with a direct link for a long time with no observed effect. I haven't seen this before; at first it seems a good idea, but it sure could give Google a lot of "discretion" in directing users to "friendly or unfriendly" sites.

Wonder if it has any relevance for Mac users, or anyone?