Yup. This is like some of the torrent/pirate sites, where the ordinary safe-harbor type of defense would be "Who? Us? We had no idea people were doing that sor

Yup. This is like some of the torrent/pirate sites, where the ordinary safe-harbor type of defense would be "Who? Us? We had no idea people were doing that sort of thing!" and gets shot down by "Yeah, you were designing and advertising it specifically to enable that sort of thing, attract people who would do that sort of thing, and talked at length about how your site was entirely for doing that sort of thing."