> I haven't seen any mass protests about at-will employment. Why not?

The cases are not comparable because if an at-will employee loses a job with one employer, the employee can often find a job with another employer.

> Vaccines have been required in other jobs, tests have been required for jobs, and yet no mass protests. Why not?

The cases are not comparable because, as far as I know, there is no testing option in the Canadian regulation. Also, as far as I know, there is no exception made to the 14-day quarantine period for those who cannot be vaccinated because of either a negative reaction to a prior vaccine or deeply held religious convictions.