Most of the people complaining probably know someone who did. Picture, if you will.
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Employer hires someone for cheaper. Doesn't need to be an immigrant, but for the sake of what we're discussing, assume it is.
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Employer gradually reduces the hours of a current employee for pick your reason. Likely current employee is part-time because they have few protections.
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Current employee's hours reach 0.
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Current employee quits because well, they're not getting hours.
That employee has successfully been replaced. Legally.