Fair points in the main, but one of the most beneficial sides of bulletin boards like these is the free and honest exchange of information.
How do trip advisor and the like get away with having people put frank statements about their impressions of various tours and hotels, if the website owner is somehow responsible for what's said by individuals?
Obviously it's a fine line, but I reckon if a flying school's worth its salt it should welcome criticism and/or plaudits as appropriate. The pool of individuals involved in Australian flying is small enough that if attempts are made to sling mud, the truth will surface quickly enough.