At least by exposing it publicly, the company is now forced to address the issue in front of... well everyone. And, other people can see if they've been screwed over as well. After decades and decades of employees trying to resolve matters internally and quietly, and just getting retribution, does anyone actually think being quiet is still the way to go?
I mean, that's how #metoo got started, by going public and getting people together to push back on corporate BS. Same applies here, and for all corporate issues.