But... But... How will I pay slave wages then?

Yeah, H1A and H1B visas (as do others, I'm sure,) tend to allow employers to do shitty things since they're basically able to ruin the workers' (and sometimes their families') lives. As an immigrant to another country, it's not fun living with that fear and stress all the time.

That's better than what we currently do in Canada but it still depresses wages because now corporations can just ask for more supply to meet their labour demand. There's no upward pressure on wages when the demand crunch has a relief valve to import as many people as they need.