Glassdoor is not reliable. Companies can pay to suppress negative comments.
Are there trusted impartial review sites?
They exist, but are very few - their articles get stolen by unscrupulous copycats, or the AI slop buries them in noise. It's like panning for gold, but instead of a bubbling creek it's sewage runoff. I hardly ever find trustworthy results on the first page any more, you got to go several pages deep until you stop seeing the "Top N you absolutely need to buy!" results.
I've interviewed a candidate that created dozens of GH projects, each one just being a list of tools for various topics. So they'd have "Programming tools", "Security", "Databases", etc. They may have thought that on the surface it would show them as a well-rounded candidate, but if you dug into it, it was just that - a set of lists. Even AI generated slop that gets churned out by the dozens these days has more content than those projects did. Even worse, when asked about their experience with the tools, the candidate couldn't give a useful response. It was like asking about the Donner Party and getting an answer about birthday parties.