The victims of the errant theory used by the FTC are legion, from Standard Oil to Microsoft. But for the FTC to be reduced to bullying piano teachers is just too much. It turns tragedy to farce. There is not one child learning their arpeggios who will benefit from this, and not one teacher will experience the glories of competition to a great extent than he otherwise would.  

Source: Piano Teachers, Beware: The Feds Are Onto You | Foundation for Economic Education