This is brilliant. Get tons of people who current just use GitHub for public repos to put up some private ones, then in a month send them an email saying "start

This is brilliant. Get tons of people who current just use GitHub for public repos to put up some private ones, then in a month send them an email saying "start paying, or we'll take away your private repos". People are lazy, so a lot of people once they've already put the repos up won't want to move them. Inertia was working against them; this gets it working for them.