I was a regular user of Glassdoor and thought the site was somewhat useful. The trick being that I would just self filter the 1 star (you'll be sold into slavery if you work here) and 5 star (we have unicorns that fart rainbows) reviews. I even contributed off and on and most of my reviews were 3 and 4 stars over the prior 5 years or so.
That opinion has since changed.
I wrote a 2 star review about something that had happened at one organization. Suddenly my all reviews have been removed from their site. I wasn't told about their removal or why they were removed, I discovered it on my own. I sent an email asking if there was a problem.
The first response was a message that they reject bogus reviews. It followed up by saying users should only post content related to jobs they held. I replied and offered to provide proof that I had worked for or interviewed with every company I had commented on. The next claim was that they remove the reviews "when they have sufficient reason to believe they were written by the same person". My reply was what are you talking about, yes, I wrote them under my account. Of course they were written by the same person. Lol. The most recent response was en email claiming I was impersonating another person or their email or misrepresenting current or former affiliation with an employer ( we're full circle!). I have no idea what they are talking about. The discussion was happening using my primary email, the same email I used to register for their site years ago.
I can only guess that it was the recent 2 star review. I can't be sure because they would not provide a concise reason. It was just random clips of their terms of use and guidelines that seemed to accuse me of doing something nefarious. I do know that I no longer trust their review site and personally no longer utilize it.
The only condolences I have is reading about experiences from other people. It sounds like a few have had the same exact events happen to them too.