My first week at the company was nothing like the great workplace describe on Glassdoor. I'll spare the details, but suffice to say it was the most abusive workplace I've ever seen.
Later, I realized that all of the 4 and 5 star Glassdoor reviews started after a specific date and arrived in a short burst. If I went back far enough, the reviews were consistently 1 or 2 stars.
I tried to leave a fair 2-star review using the most dry and basic facts without any exaggeration or hyperbole. It stayed up for a month before disappearing without explanation.
Glassdoor is not a place to find honest company reviews.