[someexgamedev]

I've heard of places where HR requires you to write a (probably) glowing Glassdoor review during onboarding. Or severance which is conditioned on not writing a negative review.

Goodhart's Law at work.

[phyzome]

Easy enough: Write the glowing review, then contact Glassdoor and report your company. I'm fairly sure Glassdoor would then remove all the reviews.

[jacquesm]

No, they'd offer the company to remove the negative review for a fee.

[izzydata]

Write a good review, receive your severance and then change it to a negative review.

[waterlink]

In some countries the law specifically mentions that such terms of severance agreement is not valid and cannot be enforced.