Is that a concern for domestic students? That would be my response.
Domestic students aren't restricted to hours they can work off campus, so I'm not sure why international students would have that restriction upon them.
I would argue in the bigger picture, as well, it helps them network and acclimatize. It helps them financially support themselves, as is done by Canadian students. Appreciating the concern, it would have to be for all students, and not just international students.