This is HN, not a cocktail party. We've seen post after post about using the "demographic targeting" capabilities of facebook and google to target individuals,

This is HN, not a cocktail party. We've seen post after post about using the "demographic targeting" capabilities of facebook and google to target individuals, about the more general problem of de-anonymizing data, and about how damn hard this type of "abuse" is to prevent even if companies were interested in spending serious resources to prevent it. We further understand that while this type of loophole exploitation is beyond the interest of the vast majority of people, there is an entire swamp of gray-market software developers willing to package the loopholes into nice user-friendly tools in exchange for a handful of bitcoin. The cards against humanity stunt may well be a scam, but it's not nearly so damaging as the scam of pretending that ISP sales of user data will preserve privacy.