All we want is change in the industry. This is enough for that I believe. Your name on the internet, your employees calling you out (anonymously). It's social proof. That effects your awareness and also your future job opportunities.
I think if we do something similar to blind. One review per company email address it guarantees that each review is from one anonymous person in the company. This prevents smear campaigns and ensures that you get a clear and accurate picture of someone.
Presumably Glassdoor started as a place to leave honest feedback about companies. But they had to make money somehow, and individuals aren't going to pay to access those reviews. So their customers are now the companies themselves, who can buy "employer accounts". While it still exists, their business model did a 180 degree shift.
Regularly used ratemyprofessor back in college, years ago.
We need something like that. Rate my manager/head of engineering @ some large org. Also get a legal team ready for all the lawsuits that will come your way for whoever wants to pursue this idea. I'm all for supporting it though.