I have noticed this, too, in numerous different cities and towns throughout Canada, over the same time period that you mention.
This approach hasn't been good for anyone involved.
The employees typically seem quite miserable, as would be expected given their circumstances.
Economically, this approach also significantly increases demand for supply-constrained housing, health care, infrastructure, and goods. This in turn exacerbates Canada's current inflation problem, and it's made worse by these imported workers not offering any real (in the economic sense) productivity gains to help offset the increased demand.
The combination of these factors, plus cultural differences, seems to have resulted in a steep decline in the customer experience at such establishments over that period of time, too.
I now spend a small fraction of what I used to at such businesses because the experience is typically poor, at least relative to what it was in the past. I know others who have changed their spending habits, too, for the same reason.