Same here. Glassdoor keeps saying everywhere that companies have no influence on the reviews. But they absolutely allow removal of bad reviews, even going as far as contacting our HR team offering it as a paid service.
My employer keeps asking us to "leave honest reviews" to help with hiring efforts. In practice that means they want us to leave GOOD reviews to raise rating scores on websites such as Glassdoor.
Sorry HR, I'm not going to do your work for you.
We eventually got it removed, but it took an extreme amount of effort to convince them to take it down.
I can't imagine how difficult it would be to take a review down that isn't as easy to prove illegitimate.
This was in 2020, so maybe things have devolved since then..