I'd like to think that local communities will have at least somewhat of a filter for ignoring people who don't consistently make progress from week to week.
Unfortunately it's kind of hard to kick someone out of a meeting when everyone is just a member and on equal footing.
I've been in so many meetup groups which started off with really smart hard working people that have been slowly run down by tire kickers and dreamers coming along each week but never actually making any progress on their company.
EDIT: Ah just noticed in the FAQ that they kick teams out who don't ship, awesome, good to see them keeping the quality high.