The founders hired the contractors. I don't think it's fair to call AirBnB spammers, and it's unreasonable to assume malice, but questions around oversight and transparency are reasonable ones to ask.

Indeed, entirely the point I was trying to make; namely that it's not fair to call them spammers. In response to the fact that they hired them + that it raises questions - sure, but there are two sides to the argument and that needs to be highlighted.

UPDATE: Deleted. Sheesh. I know it was a meta-point, but legitimate - downvoting for trying to actually provide balance? I think it's worth calling that out.