[georgieporgie]

What about when people are employed to work on a project?

Then they are employed. Working on a project without an employer is not employment. Working on contract for an employer is generally referred to as "self-employment" although, technically, if you're operating under your own business, you're an employee of your own business. I really don't understand why HN is so upset by this distinction. Everyone here is perfectly happy to distinguish between "project" and "start-up" but not, apparently, "project" and "employment".