[eli]

I don't really see how. If I'm unhappy, I'm not going to lie just because I want to anonymously live up to an unspoken expectation.

Unless you think people fear being ID'd... but that's a problem with the whole model.

Anyway, I'd imagine many glassdoor reviews were generated this way. If employers didn't ask, it would be mostly bad reviews from ex employees. Few others would bother.