Unless the company is using the restroom dishonestly, the company is doing it because they want good customer experience from excellent honest ratings; inflated ratings are thus sabotaging everyone else's experience.

If the company is using them dishonestly then inflated ratings are just serving the dishonest purpose.

Moreover, in the honest case (which I do not think applies) if the company is trying to use (known to be highly culturally variable) star ratings as a substitute for a simple binary “you would want to ride again with this driver” flag, they are idiots and overcomplicating what should be simple.