The current structure treats them as serfs and says what really matters is the efficiency of the overall system, or its ability to generate a profit for its shareholders, or whatever. In short, the problem is these guys work too much in exchange for too little. Whatever theories anybody might have about the market, the role of the state in the market, etc, those are the basic facts on the ground: over-exploited workers seeking dignity where they currently lack it. The idea that they are "contractors," in the way that you or I might be contractors sometimes (I assume you are a tech worker), as experts in a technical field, is a sick joke. They don't have any power to get what they need, in that market, as individuals (they aren't even allowed to set their own prices!). If they could bargain collectively, they might. That's the context here.
When somebody enters the discussion and says, "Well, yeah, but what IS dignity, anyway, when you really think about it, man???" you'll have to forgive me if I don't believe they're doing it out of a devotion to clarifying terms but because they just want to take Uber's side in the fight. Yes, it's obscurantism.