I never said anything Uber was doing was illegal. OP said that the fact that people choose to work for Uber means that Uber’s employment practices are therefore

I never said anything Uber was doing was illegal. OP said that the fact that people choose to work for Uber means that Uber’s employment practices are therefore legal, because it was the employee’s free choice. I don’t think that’s a sound argument. I suspect based on the original article that you may have the opportunity to read the legal analysis you ask for soon if the FTC determines any specific company violated labor law wrt gig work.