I have done this for a company who was knowingly making materially false information to investors. The company merely asked glassdoor to remove it, and they did. It's probably not worth the liability to glassdoor to have reviews that actually show material deficiencies in a company, like lying about benefits.

I've also done this on yelp when I was working as a contractor when I should have been an employee. The company informed yelp I was an employee, so my review was removed (yelp only has a policy employees cannot leave reviews, they had no such policy for independent contractors at the time I left the review). This was doubly insulting because I tried to inform yelp the entire reason I left a review was because I _should_ have been an employee and not a contractor, and yelp informed me I was actually an employee so I could not use their platform!

I also disagree about it being a career ender to publicly reveal serious dishonesty in your employer. The company I work for now usually laughs when I talk about all the shit I've been through and spoken of ( I worked for two very dishonest companies, out of the dozen or so I've been with). If you work for honest people, then they have a vested interest in the dishonest being exposed (its good for their business).