Crowdsourcing may be killing a lot of jobs. True, it’s still a nascent business strategy that works well only in certain scenarios, and it can’t be lumped in with outsourcing as the cause of mass layoffs. As is the case with outsourcing, though, it can be particularly difficult to quantify crowdsourcing’s negative impact. Lost jobs — or, in the case of small businesses that compete with crowdsourcing, eroded income streams — are an obvious starting point.