> The reality is that even the most transparent companies out there (eg: Gitlab) do not disclose individual salaries.

I don’t think Gitlab is anywhere near the most transparent company. I’ve definitely seen companies proudy list all their employees’ salary in a blog post before, so the most transparent companies do actually do that (or they did when I saw their post a while back anyway).

To be fair I’ve never seen it in companies where it’s impossible for everyone to know everyone.