It is quite standard for Au Pair Agencies to cover a fee; it goes towards administration, care while the au pairs are abroad, events and orientation.
We have been working for 2 years successfully in Argentina with currently 30 happy au pairs placed with satisfied families, which I don’t think we could do if we were “fraudulent” or out to rip people off. Unfortunately there is not much we can do about a bitter au pair, who was asked to leave for not working properly and “treating the house like a hotel”, bad mouthing us across the internet, and of course she is entitled to her freedom of speech. The only thing we can rely on is the positive feedback that we consistently get from our clients content with our service and who know that we are true to our word.