If the site exercised enough direction and control so they specified you must do the work at their desk in their working hours. If they deny you the right to substitute an acceptable alternative person, or work for others, then the relationship would start to seem of employment. There's quite a lot of other pointers.
Uber seem to fail most of these "in business" points for their drivers with their heavily one sided agreement.
Going back to IT contractors and IR35 in the early '00s it's been a constant "discussion" of where the line is. For contractors we had to get quite good at amending contracts, and satisfy other aspects to be able to remain unaffected. In that case the govt wanted us to be employees, contractors didn't!
Uber seem to fail most of these "in business" points for their drivers with their heavily one sided agreement.
Going back to IT contractors and IR35 in the early '00s it's been a constant "discussion" of where the line is. For contractors we had to get quite good at amending contracts, and satisfy other aspects to be able to remain unaffected. In that case the govt wanted us to be employees, contractors didn't!