But if the site is self moderated, for every racist user, every user will need to block a user once, where as if the shared list was crowd sourced, the action would need to be taken once.
Hubski has 10 users, scenario 1: one racist user, posts a comment, 9 people filter the user
Scenario 2: 10 users, one makes a list and adds the filter, same effect if subscribed to the list.
Hubski has 1 million users, 10 racist users
Scenario 1, each posts a racist comment - ten million filter actions must take place to 'self moderate' the racism
Scenario 2, a user takes 10 filter actions publicly, same effect as with scenario 1, for all subscribed.