I've never used Glassdoor but I know people who have. Seems like a great way for them to destroy their own business.
Even if I were inclined to do so, I would absolutely NOT do so if I had to provide my real name. They will be the one company to never ever get their user db hacked/leaked, right? I can trust all current and future executives there to safeguard that info, right?
I can't see how anyone with legit negative things to say against a current employer is going to feel comfortable using the service going forward. When enshittification bites back!