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I believe glass door removes negative ratings

You have to pay up first, right?

Right, but it's not you, but your HR department. Which is also exactly the reason it's a bad idea to write anything about your current employer.

Also Glassdoor has revealed who posted reviews (including IP addresses) to employers when pressured to do so.

Can you cite a source?

To be fair, they were ordered by a judge after they fought it in court. Non-compliance isn't an option here.