Why not eliminate unscrupulous dealerships from cargurus?

Many of these dealers are poorly rated because of their hidden fees, or "We won't honor the advertised price unless you finance through us." Why doesn't cargurus just not allow dealerships to advertise with you folks if they get these kinds of reviews. You are wasting everyone's time and money by letting unscrupulous dealers do this to consumers. Why doesn't cargurus set a precedent and put some rules in place for hidden fees. These low advertised prices mean nothing if you're going to get bitten in the back end and want to finance the car yourself or purchase with cash. COME ON CARGURUS, do something with the loser dealerships!  PLEASE!!! Thanks, Dale