Glassdoor removed all of my reviews after submitting a negative view about 1 company. Previous reviews had been mostly positive or just neutral with provable facts.

Having seen their internal Blind, social Slack channels and culture vs. the Glassdoor reviews, and then submitting my review which really "went against the grain" of Glassdoor, it was clear there was something going on. I just didn't care enough to find out.

As these systems age, I think they're all missing one feature - "what are ratings or reviews from the past 6 months".