I've had several folks come to me over the past few years with tales about abusive behavior by trainers. None of them took their concerns to a test commitee or the AKC. IMO if you see behavior that in your opinion is abusive, you have an obligation to report it. If you did not see it first hand, it did not happen. If you saw it and did not take the responsibility to act on what you saw, then you are complicit with the abuse you claim to have witnessed.
As for new clients, anyone who places a dog with a pro who has not first checked references and watched several training sessions is derelict in their responsibility to their dog.
But that's just my opinion and I could be wrong.