Do people not talk to the contractor?
I remember riding along in a taxi, sitting up front, having a conversation about how he used his taxi license to get around the anti uber laws (that have since been repealed) in my state.
I talk to the guys who I hire online. We often end up working out a deal behind the platform. I once hired a bloke to help move stuff out of my garage, and we talked about how he is having a hard time saving money after moving here to study, which is why he was taking airtasker stuff.