I think this is true if the system is global or there’s model where Sybil resistance is “here everyone, have an access to write to the database”. In a system like HN there’s value in Sybil resistance. On your Twitter feed, almost none.

So I disagree this is a non-starter, because we didn’t find a solution in the past, but rather an ideal place to start and a great space to discover new Sybil resistance mechanisms (which we have over the recent years).