“an anonymity built into the culture of cons” – Not a particularly strong assumption of any con I’ve gone to, outside of the simple fact that it is a large group of people, many of whom have not met each other yet. Hell, a large part of the point of going to cons is specifically to know and be known to people who share your enthusiasms.
They’re making a decent point about the fact that information may be gathered, but they’re expressing it very, very badly.
