cnada does not make employment or housing impossible without proof of citizenship there are massive illegal labor market especially in the construction food service jobs. Also the check is minimal and poorly enforced or tracked. It's the same situation in rentals there are routine subletting via cash one of my partner so again the enforcement mechanisms fall apart here and you will see this to be a repeating pattern throughout canadian society where there are laws but are hardly enforced or resources spent equally.

if illegal presence has almost no chance of interior enforcement, then overstaying or working illegally becomes a rational bet. If arrests, detention, removals, and employer raids become credible again, behavior changes that's the whole point of ICE raids they know they can't deport millions of people but to change the behavior of the demographic that they are targeting. This is something that Canada neither has the political capital to pursue.