I believe Team Blind does this and tries to deflect the gaming through blind anonymous reviews but where Blind validates the poster possesses a company email.
The problem is that if it gets too successful then it's easy for companies to classify emails from the Team Blind domain as spam. Having said this, if that happens then that might already be a yellow flag on the part of the employee.
Why should we trust TeamBlind any more than Glassdoor? Right now their monetization strategy seems to be "VC funding to get critical mass, worry about monetization later". Seems like a recipe for betrayal to me.
The problem is that if it gets too successful then it's easy for companies to classify emails from the Team Blind domain as spam. Having said this, if that happens then that might already be a yellow flag on the part of the employee.