I'm with you most of the way, I think that most of us on HN have more freedom than what alot of people would consider slaves, but I think you're ignoring the coercive factors of economy and society.

I think that people can be placed in compromising positions by economies and cultures that they're a part of. A concrete and probably relevant example could be student loans: a student incurs a tremendous debt for their education, only to be obligated to work in order to service that debt.

Also, your last sentence irks me. Contributing to your community does not mean to have a job. There are plenty of ways to 'pull your weight' that don't involve making money. Building community spaces, plain talking to people, working on a neighborhood watch are all beneficial but are often unpaid. Paying taxes does not necessarily make for a successful community.