The main way a review can be removed is if a problem report is filed due to the review being dangerous (eg outs the provider's incall location) or bogus (eg provider has proof the reviewer never saw her) or is in error (eg performance score is too high), or some other reason that justifies removal.  In the latter case, Admin may edit the score themselves.  

The author could request to Admin that the review be removed or edited after it's been approved, but from what I've observed over the years these requests aren't granted too often.  

-- Modified on 5/11/2017 1:56:47 PM

a very good reason for doing so.

...review edited or removed.  It's much harder for the provider to get a review of her changed or removed.