The company I left a few years ago did this in order to obfuscate the rampant issues that were being unaddressed.
The recipe was to hire in a bunch of college grads, and while they're still nervous about their first corporate gig, have the VP of Human Resources email a demand that they post a glowing review.
And, when the rating inevitably continues to be hammered by negatives, instead of addressing the patterns within the negative reviews, HR would send that review demand to the overseas team(s) where the jobs were even more tenuously-held.
While HR made glaringly obvious positive reviews, themselves, of course. Pretty insidious.
Or even worse, from https://www.glassdoor.co.uk/Reviews/Lab49-Reviews-E257101.ht...
> * Requiring new joiners to write a Glass Door review as part of their on-boarding process, presumably in an attempt to improve their rating.