There is this shortage. There is the need for caregivers. There's a need for people to work within homes, because with the health care system the way it is and the shortage that's going on, there's a push to bring the elderly into the household, and there's a need for these people to be cared for.
In regard to children, because there is no national universal child care within Canada, there is a need for child care and day care within the home also. So understandably, there's a need and a push for these labour forces.
As to the history of why this live-in requirement was implemented by the government, I'm not quite sure. It's these exact pillars that are further isolating the women and further exploiting these women.