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.
It would be bought and killed by the capital system just like Glassdoor was.
How was Glassdoor killed?
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.
Depends on who's running it. Like any other company, corruption can occur; but it can also not occur.