I have witnessed similar things happen. I worked at a company with a very hostile work environment where lots of people were unhappy for various reasons. I was

I have witnessed similar things happen. I worked at a company with a very hostile work environment where lots of people were unhappy for various reasons. I was subscribed to the company's Glassdoor page and I would get an email notification when a new review was posted. About half a dozen very negative reviews were posted but Glassdoor removed all of them, if I look at the company's page I see a 4+ star rating with just a couple reviews from the owners and people who were told to leave a review when they joined.