I am interested to hear your reasoning on this. To me, thinking through it, I see some potential commonalities but the sine qua non of being owned as property fails. Is the argument that people have to work in general to survive, and it is the fact that they have to work what renders them as a “modern slave?” I hope not because that seems facile.
That is not the argument. The argument is that Uber business model is more cost-effective than Slavery. (And without trying to sound insensitive here)...the "slave owner" still bears the costs of his "slaves".