> Looking at the current job listings on your company's career section will be the very first thing that everyone will do if those salaries were to be made public.

This right here I think is the real reason companies do not disclose compensation in their listings. Their current employees fall below the range and they do not want them to know. This is unfortunately a widespread problem in tech, where companies constantly offer more for new hires than what they pay their own employees for the same work. The new hires that have joined will then find themselves in the same position next year when their compensation falls below what someone will be hired at that year! And the cycle continues. It's absolute madness if you look at it from the big picture perspective and there are some fundamental problems with the way HR orgs are structured that need to change. From an employee perspective, the most optimal thing you can do for yourself is to move companies frequently and that is the reason for the crazy churn we see in this industry.