Why do some companies blacklist employees who quit on good terms?

Sun_Kim-Ai
Why do some companies blacklist employees who quit on good terms?
It's a practice I'll never understand.
I admit we do blacklist some ex-employees, but only because they got fired for stealing or worse, not because they quit.
This morning a guy who's been with us for almost five years announced his intention to quit because he found his dream job for next month.
My sister (she's his boss) isn't too happy about this, but after they discussed the matter and realized it's not about money or dissatisfaction, as he just really wishes to change job, she thanked him for noticing us with ample time (he'll quit in February) and even offered to write a glowing reccomendation letter for his prospective employer.
I think this is the norm, but I've heard about companies who blacklist and get vindictive about employees quitting.
Why do some companies blacklist employees who quit on good terms?
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