I'd argue this is true for paid positions as well - particularly ones where work keeps getting dumped on one or two individuals to keep up the whole artifice while others move on. Eventually one or both of them have had enough, and then there's no one left who remembers why the spangle is always switched to the left on a daily basis...
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I witnessed this situation firsthand, a critical support person quit, and their notice period was basically them trying to teach the PM their job. I remember them laughing as they walked out "he isn't going to remember half of what I do." And low and behold, noone could pickup where he left off.