Why? The problem with complaining (such as in an echo chamber like HN often is too) is that it is a way to vent frustration, taking the pressure of an issue. So in a way complaining actually helps the ones you are complaining about.
That's an unlikely counterfactual. Most likely if you don't complain, fewer people are aware it's even a problem and the company would just assume no one cares.
It's quite easy to produce a counterexample to your claim. Harvey Weinstein immediately comes to mind. It was complaining that drew attention to his abuses and ultimately led to his conviction.
Women equality, #MeToo, sexual consent issues are all pretty much at the forefront of today's cultural issues. Harvey was an open and shut case, but don't forget the Supreme Court justice Brett Kavanaugh, or Andrew Cuomo, Louis CK, etc. (Some weather the accusation (s) some don't.)
Why? The problem with complaining (such as in an echo chamber like HN often is too) is that it is a way to vent frustration, taking the pressure of an issue. So in a way complaining actually helps the ones you are complaining about.