That doesn't mean anything. They can and will change course depending on the circumstances, and the community could agree with them depending on what the circumstances are, effectively making it a non-issue.
I think it's normal. Poor food may mean many things and most of them are not malicious. But being treated rudely or uncaringly? You deserve your bad review.
Why would I write a good review? If I go to a place and pay I expect to be treated well; being treated the way I expect is not noteworthy (or "reviewworthy")
"why would someone abuse this" shows an incredible naivete. Anything that can be abused will be abused.