Once upon a time there were things called jobs, and they were well understood. People went to work for companies, in offices or in factories. There were exceptions — artists, aristocrats, entrepeneurs — but they were rare.
Laws, regulations, and statistics were based on this assumption; but, increasingly, what people do today doesn’t fit neatly into that anachronistic 1950s rubric. I’ve had the pleasure of trying to explain to border officials that my “job” consisted of contracting in Country A for a client in Country B, while also writing books and selling apps. I don’t recommend it.